[Galaxy S III Q&A, Help & Troubleshooting] Goldendawn:
Hi and Merry Christmas everyone.

I have a little problem I am hoping that you might be able to help with.

Little history - this phone was stock until today because Samsung update killed the phone (everything was FC, and reflash, format etc, didn't fix it! Damn you Samsung for ****ty build!!)

Anyway - this is the fifth phone I have Rooted and Flashed to custom ROM - so I kinda know what I am doing, but this one has stumped me a little (wasn't doing this one because I used for Work, and it was under Warranty - out of warranty now anyway, so.... just forced my hand to root/upload custom ROM it)

Every Time I do a new ROM install I wipe the Data/Factory Reset, Wipe Cache, Wipe Dalvik Cache, Backup EFS folder, and Format System (this is the way I did it with all my phones, and the way I was taught to get really stable working ROM).

I am in New Zealand with an GT-I9300 (nice Red Brand) - brought from DickSmith, Unlocked.

The problem I have is that when I install a custom ROM from here (so far I have tried three), I keep getting the "Emergency Calls Only" issue and the Phone won't manually connect to my phone carrier (New Zealand - 2Degrees).

What I have done to look over the issue so far is:

1) Installed Recovery cwmtouch-6.0.3.2

2) Installed CM10 Final cm-10.2.0-i9300 - tested to make sure phone was working okay based on CM10, worked fine - can make calls, and stock CM10 working perfect. The Baseband Driver is 1930BUUGMJ3, and the IMEI is 3539********** (so everything okay there)

Build number: cm_i9300-userdebug 4.3.1 JLS36I dfd0cbed2d test-keys

*#1234#

Doesn't work on CM10.... Dialer Codes don't work on CM10 - blah!

3) Installed S4 Revolution v11 ROM. Since this was already using 1930BUUGMJ3, I didn't flash the MG4 that's included in the ROM installer. Everything working as expected, however I am always getting Emergency Calls Only. Confirmed Baseband Driver is 1930BUUGMJ3 and the IMEI is 3539********** (so I would think everything okay... but no - will not connect to my New Zealand Carrier).

*#1234#

AP: i9300XXUGMJ9

CP: i9300BUUGMJ3

CSC: unknown

4) Re-flashed this ROM, and this time replaced the modem driver with the MG4. Again all working fine, but still no Carrier connection.

5) I installed the ROM Android_Revolution_HD-SGS3_40.0 - it replaced the Baseband Driver with the 1930BUUGMJ3 again, and the IMEI is 3539********** (again no change), and once again this didn't work.

*#1234#

AP: i9300XXUGMJ9

CP: i9300BUUGMJ3

CSC: i9300OXAEMC2

6) Rebuild back to CM10 - everything working again.

The one thing I am noticing (not sure if this is the problem - but just adding the differences I see) when I use the IMEI check (*#06#) with this ROM (and Revolution) I notice that the IMEI SV is showing (/11) at the end of it - So it is 3539*********** / 11. However, with CM10, it isn't so is only 3539***********

(however, when I look at Status - it has the IMEI showing without the IMEI SV, and the IMEI SV shows in the IMEI SV row).

So this probably isn't the issue either.

Serial Number is the Same also - so that hasn't changed.

The Device Status is Custom for CM10 and this ROM - so nothing changed there either.

So I am a bit stuck now, I don't know where else to go - because I was going to manually update the Modem, but, I don't think that is the problem since the Driver seems to work okay with CM10. And more importantly, I am a little worried about just flashing random stuff on the phone without having some clear understanding on what I am flashing. So don't want to just flash for the hell of flashing - so if someone has some guidance that would be helpful.

Can anyone else give me some ideas on this?