I just migrated my VZW phone to AT&T, and was having issues with texting. Working with the ATT rep, figured out that "Message Center Number" option was disabled or not available on the VZW install. I don't have hidden menu enabled, running 4.3, so nothing with *# will work. So I thought before, I go ahead and do a CM10.2 install and try it out. I wanted to see if I can install stock 4.3 (or older) ROM on my VZW phone. The GS3 phones offered by phone vendors almost identical.
Thanks for your help in advance.