yashsingh1/xdaforums huggingface dataset:
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] meleii:
Ty. Will posted in op.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] Fizwiz:
Why when i try a ATT modem, thats doesnt work on a Rogers Galaxy S3?
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] meleii:
At&t modems are model for at&t network. They will fail on any other network.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] paracutin:
You are correct. :good:
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] angelis19:
No mobile availible

Hi i flashed the modem, but im not getting any mobile data, im confused as to what to do, can someone help me please?
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] 08tundra:
Check ur apn and ur imei and make sure they are ok
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] meleii:
Do you have at&t? If so how did you flash? Which modem? Did you do any wipe? And do you still have your imei in tact?
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] angelis19:
I have att, i went with the directions from the thread, i flashed I747UCLG1, my imei dissapeard, i injected my imei with directions from another thread, signal came back but it was stuck on edge network, can not make or recieve calls, not mms, well one came through but not again. ive tried everything i could think of.

edit i checked the apn settings and they are normal
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] meleii:
Can you post what your APN settings are?
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] angelis19:
Name: AT&T PTA

APN: pta

Proxy: Not set

Port: not set

user name: not set

password: not set

server: not set

mmsc: http://mmsc.mobile.att.net

mms proxy: proxy.mobile.att.net

mms port: 80

mcc: 310

mnc: 410

Auth. type: none

APN type: default,mms,supl

APN protocol: ipv4

enable/disable apn: enabled

Bearer: unspecified
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] meleii:
Everything seems right. Did you try restarting your phone? And did you read the imei injection thread to see about possible issues from it?
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] angelis19:
Yah, i think i could have done it wrong, there was another thrad saying the imei is on the back of the phone, and i used that one since i didnt have a backup , i didnt even know i needed one. so i dont know if i could use that one or not, i had no other option i could think of so i just went ahead and did it.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] meleii:
Your imei would also be on the box your phone came in.

For safety reasons when I first unboxed my phone I took a ss of my imei so if anything went wrong I would have an image if it.

The modem also changes your imei sv# so try flashing previous modem too.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] angelis19:
Ive flashed all three modems, imei seems correct, still no change. The only other thing i can think of maybe something is up with att. I doubt that everyones else cell phone is currently working, Could a bad sim card be a possibilty? i just find it odd that the sim would mess up the same time i lost my imei, so i didnt think it was that.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] acme anvil:
The modem is radio so in order to connect to AT&T you'll need to use a radio that's compatible with their network. Opposite of me in Canada running an AT&T rom and I use a modem for my Canadian carrier.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] rwcj63:
whatever modem that they put on it is compatible with AT&T. all i did was put in my APN settings and i was good to go. but my concern was when i flash some of the newer roms.

so all i would need to do is flash the appropriate AT&T modem with whatever rom i choose and i should be good to go?

thanks for the help.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] acme anvil:
Yup. Just update your modem. May also want to check your bootloader to make sure it's up to date.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] dstruct2k:
NO NO NO!!

The M has a

different chip

!!

You need to use

M

radios on an M device. The network you're connecting to is irrelevant.

This is why I don't specifically call the U model "the AT&T one", because they're good on any network, but have different modem hardware.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] diablo009:
+1

The modem is DEPENDENT on the device, and is INDEPENDENT of the network you are connecting to.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] rwcj63:
thanks guys. luckily i haven't flashed any yet but i was going to today to try them out. i
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] MildSe7en:
I checked my baseband version = I747MVLDLK4 (November 2012 modem)

I downloaded I747MVLDMF1 (June 2013 modem) > Flashed in TWRP

The flashing took about a minute, then said it completed. I then cleared cache/dalvik and reboot

my baseband version still says I747MVLDLK4

Is this normal ? or did it not flash properly ? I've tried this twice so far and same issue.

Thanks!

=======================

Update nvm, i fixed it.. it appears I was trying to install the wrong zip file.. my file system was restructured after going from 4.2.2 CM back to 4.1.2 TW
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] MrFhenix:
Just to get you of the curiosity i flasshed i747m MODEM on a i747 and it didnt work just revert it back to the proper latest i747

General information

LTE band for almost all northamerican carriers is LTE band 4 (1700/2100) so your good (actually i747m has more modem updates as it has more carriers other than i747 that only for ATT
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] dstruct2k:
Exactly the same results I had trying an I747U modem on my I747M. You're lucky it didn't damage your EFS partition in any way. I put my device on the line so you guys don't have to. :D

Also, yes, that's exactly why there's more M updates than U.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] flatherskevin:
Is the November modem from 2012 the most recent modem for i747U?
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] akitten007:
New ATT update 4.1.2 is out, along with a new modem. Just letting everyone know of the it.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] Swiftks:
Anyone pull the files yet from a system dump?

Sent from my SGS III
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] akitten007:
Sorry, that's not my expertise. Just letting people know of it. If you check the general section, I think someone has an update file. I'll try to find a link.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] dstruct2k:
Thanks for the heads-up, don't have an AT&T device so I'm not always aware of updates. I'll look for it now.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] dstruct2k:
I747UCDMG2 is now in the OP! This is for

AT&T

devices only. If you have issues after flashing, double-check your downloaded filesize and please post here! (You can always flash back to another modem for your device at any time.)
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] crashpsycho:
Been waiting for this all day thank you much
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] Venom0642:
Let us know if it works with no issues, great that you post it this here dstruct2k:)

Sent From My Galaxy S III SAMSUNG-SGH-I747 Running On Deadly Venom v6.1.7
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] crashpsycho:
very odd for looks like a fail on twrp recovery flash"I KNOW IT SAYS CWM" but ive always used twrp and it worked

so looks like a fail flashed in new modem got stuck at Splash screen, hard boot back into twrp flashed old modem NO love, also noticed after install of the twrp said "would you like to install SuperSU".

may this modem require the newest bootloader ??
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] dstruct2k:
Are you able to use your device on the old modem again?
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] crashpsycho:
No the device would only go to splash screen with new and old modem after dmcg2(sorry dont know exact name)

sorry forgot to put that, so right now im doing a full odin back to stock and then reroot and try some modem swapping and see what happens
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] dstruct2k:
OK, download link removed for now. I've got someone else ripping their modem and we'll do some testing before I re-release.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] PwnCakes193:
Flashed fine for me on 7/31 nightly through TWRP 2.6
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] dstruct2k:
Thank you for reporting this quickly. Sorry to cause issues for you. :(
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] nicoli_k:
It's working for me on tasks 7-20b ROM.

I didn't check signal strength, but it's full bars and installed correctly with TWRP. I do have the newest bootloader though.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] dstruct2k:
Have you installed a bootloader update previously?
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] crashpsycho:
no worries man we all find out by trial and error, if you want me to test other release let me know but i think it require the newest bootloader i could be wrong since i dont have the knowledge this like most
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] PwnCakes193:
I'm on whatever bootloader DLK3 came with. I flashed 4.1.1 stock a couple of days ago.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] Senor_Fuzzypants:
Worked fine for me. Froze at the boot screen but a simple hard reboot fixed it. Been running fine for 2 hours. On task's latest. I'm using it right now posting this.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] dstruct2k:
DLK3 was the updated bootloader. Is this OTA our chance to see who's been running the outdated one on a stock(-based) ROM for this long? lol
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] dstruct2k:
I posted this just over an hour ago.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] Senor_Fuzzypants:
My apologizes for the exaggeration. Has been running great since you released it.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] dstruct2k:
I just realized, if this is the case, everyone on stock-based custom ROMs will have to update their bootloaders if the ROM chefs move to the new 4.1.2 build.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] dstruct2k:
Apology accepted. :p I'm glad to hear it works for you. I think this is a bootloader-related issue.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] Swiftks:
Can you repost the file link, or you going to wait for another modem pull? Since it seems like a boot loader issue, I should be fine on the latest Slim Rom weekly... Maybe just put a warning in big red letters next to it.

Sent from my SGS III
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] crashpsycho:
Just so everyone know i was running Liquid smooth 2.9 and less then a week ago was running SlimBean, was also on dlk3 so i really have no idea what happen just so yall know incaase you guys might be running LS2.9

UPDATE: the modem is perfectly fine sorry for the trouble

it was all a bootloader issue as i originally mentioned. weird cuz i just ran the latest AOKP7/20 which require updated bootloader

you can repost no issues man
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] dstruct2k:
The DLK3 bootloader or newer seems to be required for the modem. I'll repost it with this warning.

modem_CWM_I747UCDMG2.zip - 19.01 MB
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] jde984:
I flashed the modem pull that loserskater posted on the old bootloaders (ucalem) without issue. So I don't think that's the issue.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] loserskater:
How did you flash it? Did you just replace the modem.bin in another zip?
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] jde984:
Yep
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] jojo_whit3:
The new modem flashed fine for me...was on Task's AOKP ROM with the DLK3 bootloader.

I have noticed that my data connection is now idling at HSPA 8 and then ramps up to HSPA+ 15 on any sort of network activity. Before it would idle at 3G/UMTS and then ramp up to HSPA+ 15.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] dstruct2k:
Maybe they traded a very small amount of battery life for a much more responsive connection? The newest modem for the M is the same way, doesn't fall back to 3G most of the time. Older ones did.

That's all I did to make the ZIP that's posted, so I'm glad it works for you. This has me even more confused about the issue above though.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] Swiftks:
Thanks, flashed with no problems. :thumbup:

Sent from my SGS III
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] noobchef:
Flashed the new modem with no problems using cwm. Everything works as it should.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] therebel88:
flashed right after you posted it....no issues. Seems like the hand off from LTE to HSPA+ is much improved. I would stick around too much on LTE with the dreaded 0 dBm 99 asu on UCLDK3...haven't seen it yet...hopefully never will! Cheers for the upload :)
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] pre4speed:
I flashed with twrp 2.6 on old 4.1.1 bootloader and no hangs or loops. Signal is still the same, speeds are close to the same. I'm running deTmobilized the latest version.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] Nucleartx:
Signal slightly better on new AT&T modem, no problem installing.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] Testman08:
Does this link update modem only or modem and boot loader?
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] dstruct2k:
Modem only. I have a separate thread for bootloaders, check my sig.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] Testman08:
Does it matter which one I flash first ?
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] dstruct2k:
Nope. They don't even have to be matching versions.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] baib88:
Q-which modem works the best for Rogers user with AOKP ROM

I am with Rogers, just flashed latest AOKP 4.2.2 Jul.20, and Ktoonsez Kernel, located in Southern Ontario, Caledon region.

currently, my area has limited LTE signals. i have NO problem getting LTE with AOKP Rom (icon showing 4g) when I went to LTE coverage ara, the highest Speedtest record shows I got 32.63mbps DL, 12.98mbps UL. Most of time, I am on H/H+. the Modem I am using right now is I747MVLDLK4. Currently I have NO Tecnical Issues with LTE, Call Display, Call quality, Call dropping, only signal strength is not that strong from stock

I am wondering which modem works the best for my situaion. should I go with latest Modem (I747MVLDMF1) or Stock (I747MVLLE8). I don't want to flash a new one, then mess up everything

Please help, Many thanks
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] dstruct2k:
I747MVLDMF1 is the newest, I'd start there. The only reason I have older versions posted is for when people get a carrier update and have issues, they can try older versions and see if they get better results.

"Stock" on my list means what shipped with the phone on day-one, most new S3's will have one of the newer modems on them from carrier updates by now.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] diablo009:
Flashing new one doesn't mess up phone. At the most, it might hit network or battery or both. And this is easily rectifiable by flashing another modem.

But remember to give a couple days time after you flash any new modem. There is a little settling in time needed for any new modem.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] Rokonacdc:
I noticed the files say CWM. Will flashing these work okay with TWRP?
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] PwnCakes193:
Yep, that's how I flashed both the modem and the bootloader
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] Rokonacdc:
I didn't realize you could flash a bootloader.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] dstruct2k:
Check my signature.

I also use TWRP, the "CWM" is simply a reminder of what it is when you find the file randomly in your downloads or on your SD card. :)
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] shoonari:
i've lost 2g/3g switch with ucdmg2 modem. Is there any way to get it back? Flashing back ucdlk3 doesnt help
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] diablo009:
Switching between 2g/3g in settings has nothing to do with modem. Modem install does not update phone ROM. Maybe you flashed some other update zip along with the modem.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] Rokonacdc:
Got it. Thanks. I couldn't see your signature on my phone. Lol
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] shoonari:
strange, im pretty sure there were nothing installed thru recovery before that.

ill try to play with clean installation of rom/modem again
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] SolidSnake33:
"Settling in time" is false, that makes no sense.

Sent From My Slim SIII

Slim Bean 4.2.2 Build 7
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] Rokonacdc:
Updated bootloader and modem through recovery with no problems. I feel like king of the world. Lol

One small thing, though. After I updated the bootloader and rebooted, my signal was on Edge. A quick airplane toggle fixed it, but it was enough to get my heart racing. Lol
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] dstruct2k:
That's normal. The newer modems drop down to slower connection speeds when the data link isn't in use to save battery.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] Rokonacdc:
Oh, okay. Well, I use juice defender anyway, so no big deal.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] baib88:
Thanks fo your answers

will flash a new Modem also improve WIFI receiption? since I flash the new Rom, the wifi signal is not that strong any more? Thanks
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] dstruct2k:
No, this only affects your baseband modem, for connecting to the towers. Try updating your bootloader maybe?
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] waiters:
How so I update my bootloader to try the new att modem?
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] Rokonacdc:
http://xdaforums.com/showthread.php?t=2321310
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] waiters:
Thank you!

So to upgrade to dmg2 I should do both the boot loader and modem? Boot loader first?

NM: upgraded modem only... Got my lte back.. Everything seems fine now :)
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] Rokonacdc:
You should upgrade to mg2 bootloader, too. It'll be necessary before long. But no problem. Happy to help. : }
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] waiters:
I've been running just the modem since last night without problems. Should I still upgrade the boot loader?
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] melvinaury:
Not necesary for the moment, but for future upgrades. I recommend that you upgrade, it takes only few minutes.

Regards
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] dstruct2k:
The bootloader updates are required to run the latest versions of Android, including the latest OTAs. If you're staying with the ROM you have, and it works fine with your current bootloader, there's no reason to update it. I would suggest keeping a copy of the latest flashable bootloader package on your SD card should you ever need it.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] Ecip:
While we're on the topic, how do u check for current bootloader version?

Ah, never mind.. Just found my own answer. Looks like when I installed the latest stable cm it also updated bootloader to the latest version, dlk4 or whatever that was.

Sent from Galaxy S3
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] jasvncnt1:
Download Root Checker the one by Free Android Tools in Google play

Sorry didn't realize you found your answer
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] Ecip:
Should the current installed modem show up in that app under 'radio'? Currently mine reads unknown.

I'm wondering how to check for that now.

Sent from Galaxy S3
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] dstruct2k:
"Baseband version" under About System is your modem version.

Are you completely sure that CM updated your bootloader? I was pretty sure they had a policy of not doing that,

EDIT: I downloaded both the 10.1 official nightly and the 10.2 unofficial build, neither of those include bootloader updates inside the ZIP.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] Ecip:
Hey, I'm really not sure. All I can tell ya is that I have the most recent release of bootloader according to root checker, and I've never updated neither the bootloader nor the modem since coming from stock rogers.

The baseband reported under system and the bootloader reported by root checker is the same; I747MVLDLK4.

Edit: I flashed cm 10.1.2 stable a month ago coming from cm 10.0.

Sent from Galaxy S3
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] tamkhanh:
has anyone tried to unlock their s3 with At&T? I called them, they provided an unlock code. I entered it but it was unsuccessful. My S3 is I747UCDMG2, rooted, 4.2.2 Rom. Any suggestions? should i revert back to older modem? thanks
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] MercilessLTD:
I'm fairly certain to unlock you must be on a TouchWiz ROM.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] dstruct2k:
You need to be on a TouchWiz ROM, and then follow the steps here: http://xdaforums.com/showthread.php?t=2014982

These steps work on only some modems, and I don't have an AT&T device to test with. I know that with the Canadian devices, the original modem didn't have these options, and the second one to come out did. Once you're unlocked, you can flash any modem and ROM and you will stay unlocked.

If you're unlocking with a valid unlock code, you probably still need to drop back to a TouchWiz ROM to enter the code.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] martinomac:
Rogers Call Name Display

Do you mind sharing your MF1 modem recovery file? The one in the OP is from Telus I believe and they do not have that feature.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] dstruct2k:
It's from my Telus device, yes, but the feature should've been compiled in by Samsung before the modem was sent to our carriers. Have you already tried the one I posted and the Call ID Name feature didn't work?

EDIT: I'll download the Rogers "return-to-stock" package for MF1 and compare the modem files. If they're different, I'll add the Rogers version to the OP.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] martinomac:
You're a good man, thanks a lot for doing that!
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] dstruct2k:
No problem! Like I thought though, the Telus and Rogers modems are identical. :cool:
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] martinomac:
Thanks again for testing this out. I re-downloaded and flashed MF1, still no go with Dandroid (S3Rx MG2 4.1.2 TW). I guess its a ROM issue as CM fixed it in 4.2. I appreciate you testing this out.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] diablo009:
Possibly unrooted too. I tried the code they gave on my wife's rooted stock, and it didn't work.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] MercilessLTD:
Same here.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] dstruct2k:
These steps work even on a rooted device, as long as you're running a TouchWiz ROM. http://xdaforums.com/showthread.php?t=2014982
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] MercilessLTD:
I am running Dandroid, which is based off of AT&T's MG2 TW ROM. On the "NETWORK LOCK" menu, the fourth option is not "NW LOCK NV DATA INITIALLIZ", but instead it says "RAT_FREE_SUPPORTING ON". Now, I did do the procedure up to the last step, and have not tested it with a different carrier's SIM, so if this last step isn't required, then it's possible it worked.

Not seeing it reported by others too much, but here's one on XDA and couple on some random forums.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] dstruct2k:
Yeah I remember there being some differences between the steps in the thread I linked and the actual menu on the device, but that's just because the guide was written for a different device. I still managed to unlock mine using those steps (although it was months ago and I don't remember specifics about the process anymore)