[Sprint Samsung Galaxy S 4 General] NoobToobTony:
This is my first post ever so ill make it sweet and to the point... And this is assuming you already have a rooted sprint s4 and know how to use odin

For those who have upgraded to the MK2 boot loader there is still away. I will tell you exactly what I did to unlock my phone and have it working perfectly..

step)1 If you are on the MK2 boot loader then NO you cannot downgrade to mf9 (I have tried several different times, several different ways) but fortunately you can downgrade to MJA, which will allow you to flash the MDC modem, so all I did was Odin [MENTION=4513677]rwilco12[/MENTION]'s MJA file found here:

http://www.rwilco12.com/downloads.p...axy S4 (SPH-L720)/Stock ROMs/MJA/Original TAR

(my phone did not boot after this I had to go into recovery and do a factory reset then it booted right up)

step 2) I signed into google and downloaded 2 files: #1 Build prop editor by jrummy apps inc. and #2 apn settings shortcut by saikoro

step 3) I used Odin to flash the MDC modem by [MENTION=1354510]Unknownforce[/MENTION] found here:

(after you flash the modem wifi will not work that's why I downloaded the build prop and apn apps first)

http://xdaforums.com/showthread.php?t=2338919

step 4) I did the international sim unlock found on [MENTION=2684188]autoprime[/MENTION]'s post here:

http://xdaforums.com/showthread.php?t=2415587

or on youtube here:

http://www.youtube.com/watch?v=lawcT1qqnLA

step5) I followed [MENTION=5699581]eheilner[/MENTION]'s steps to do the domestic unlock: (it took me a while to get into the service mode main menu so just keep trying until you will get it)

step 1. use an app to input apn or do it your self. build prop editor add ril.sales_code=lol ro.csc.sales_code=lol do not reboot.

step 2. enter service mode. *#0011# menu back menu select 0*

step 3. now you will be at main menu. pick 3 LTE

step 4. pick Pref mode set. then pick 1 GSM/WCDMA. (do not reboot)

step 5. go back to main menu then 1-1-6-7-1 (you will be in GCF) now pick GSM/(E)GPRS/WCDMA REL 8 reboot phone here

step 6. input apn if you haven't already. menu key setting then pick more networks then pick mobile networks then access point name. then menu add new APN

(I checked to make sure my calls and data were working after this.. if they are not go back and make sure everything is exactly as above)

http://xdaforums.com/showthread.php?t=2530610&page=45 post #448

step 6) I went back to [MENTION=1354510]Unknownforce[/MENTION]'s post and used odin to flash the MJA modem:

http://xdaforums.com/showthread.php?t=2338919

step 7)(optional) I used odin to flash Philz touch found here:

http://goo.im/devs/philz_touch/CWM_Advanced_Edition/jfltespr

step8) Profit

To answer the simple questions:

Yes, I stuck with the stock MJA rom from [MENTION=4513677]rwilco12[/MENTION] during the whole process, but im sure it could work with other rom and if it doesn't, just do the whole thing over I guess

I used the mdc modem while doing the unlock then flashed back to the MJA because I had no sound, the phone would not dial, and I could not get back into recovery (something about unauthorized Samsung blah blah blah...)

I could not get into the service mode main menu for anything using the MJA modem(I tried like 20 times) but it only took me 2 tries on the MDC modem but it might work for you on the mja modem

I used the at&t straight talk sim card to do this but im sure more companies will work

I only have a sprint s4 so I do not know if this method will work on other phones

And that's pretty much it, if any question, you can ask and I will try to help but remember I am not a developer or anything so for the most part you might just have to google it or just try it

Also a big thanks to user [MENTION=1902803]locorecto[/MENTION].. he is the one that came up with these steps for it to work on his post here

http://xdaforums.com/showthread.php?t=2486134&page=4 post #33

And of course the disclaimer: I am not responsible if something happens to your and I cannot guarantee that this will work for you but it did for me

And thanks again to these guys:

[MENTION=1902803]locorecto[/MENTION]

[MENTION=4513677]rwilco12[/MENTION]

[MENTION=1354510]Unknownforce[/MENTION] [MENTION=2684188]autoprime[/MENTION] [MENTION=5699581]eheilner[/MENTION]

[MENTION=4666971]Phil3759[/MENTION]