[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] hackinc2000:
I'm not 100% sure this solution its going to work for You!

But At least and after three days working with my Galaxy S3 i747 (AT&T), its the solution that works for Me.

In Three days I search the forums and test every possible solutions for the No signal or stuck on Edge problem after my IMEI get deleted after an CM10.1 update. I have been flashing roms for a long time already, and knowing the risks of doing it, I have done something very irresponsible, I had not ever make an update of my IMEI or EFS folder. What an Error!!! Yes, Yes, I know, My Bad! But I learn my lesson. But for the Spanish speakers out there "Sarna con gusto no pica" Sorry my English fellas I don't know how to translate that sentence.

First off all I'm not responsible for any of the actions the procedures here can make to Your already Wi-fi phone. Well If You are reading this, trust me, this procedures can make the phone a brick! At least You can Use Wi-fi Now!! With that said and with a little bit of humor to bring down Your emotional state lets begin:

- First, Don't trust Your emotions right now, anything can be worst. Try other solutions first, before attempt this one. Use this solution as Your last resort. Before doing anything else, No Mather what, Make an IMEI and EFS Folder Backup, before attempt this, Even with the Condition of Your Phone right now! DO IT!!!.

- For this procedure to work, You need to make or have a Donor of an NV_items backup (QCN File) from another working phone, I don't know, just ask a friend that trust You! His Identical Phone and make a backup of He's. This its the most important part. I have No idea if its going to work if the phone its from another network, or its another model, but that's a thing I'm not going to recommend To DO! But After All, ITS ALL YOUR's!!!

- Get QPST, NV reader/writer, and nv_gen as its the software You are going to need!!!

Another Good Tool its EFS Professional 2.0

--- THIS COULD BE ILLEGAL IN SOME PLACES ---

Procedure:

0. !Important !Important -- REMOVE THE SIM CARD FROM YOUR PHONE-- !Important !Important

1. One more time, Make a EFS Folder and IMEI backup!!! - For the EFS folder You can Use Root Explorer from Your Phone.

For the IMEI, Look Under Your Phone Battery or Press *#06# on Your Phone dial.

2. On Your Phone: Dial *#7284# and select "Qualcomm USB Settings" then check "RMNET + DM + MODEM".

3. Use QPST to make A nv items backup of Your phone. The Result its going to be a QCN file.

4. On The Good and Working Phone: (Your Friends One), repeat steps 1 and 3. then When the backup finish (and remember put a good name to the file, like: MyLoveFriendPhoneBK_Cause_Hes_So_Good.qcn)

Dial *#7284# and select "Qualcomm USB Settings" then check "MTP + ADB". , At this stage You can give Your friend He's phone Back.

Continue whit your Phone:

5. Open QPST and Restore the File You have just create (the one from Yours friend phone: MyLoveFriendPhoneBK_Cause_Hes_So_Good.qcn ).

By the time it finish Your phone and Your fried's, are already One!! Basically the procedure Clone he's phone into yours, fixing the NV_Items that maybe lost or corrupt. So Remember the 0 Stept, Remove Your Sim card!!! this is because We don't want Twins Phone's in the same network, First ITS ILEGAL, Second Your Friend Its going to be in trouble, Or Maybe You!!! I'm Not Shure about this one. But Anyways doit just in case.

6. Open nv_Gen and Generate a file for Your Phone IMEI. The Result its going to be a .txt file.

7. Open NV reader / writer and Inject the IMEI into Your phone. Then Reboot Your phone.

8. When The phone boots, Use the code on Step 1 to check The IMEI, If its Your's, be welcome and turn off your phone and insert again Your SIM card!.

9. At this point Your phone Should Be working as NEW!!! At least Mine Was....

10. Before End This, Again Make Another Backup Of your Phone with QPST, This time whit the corrected nv_Items.

Well That's all for my first Post ever in the forums. Sorry for not put a lot explanations of the procedures in between like QPST or NV_Gen or NV reader / writer. I'm in a Rush!!!, Just do a little search and You are going to find the procedures to the respective tools. Anyway if You are reading this, Its possible You already known how to used them.

Hope this helps Some One Out There.