I have seen a number of the more experienced forum members answer this by saying that once you are on 4.3 with the official MJB bootloader you will need to use one of the pay services to sim unlock your phone.
You can request the unlock code via this URL ...https://www.att.com/deviceunlock/client/en_US/
I haven't had any luck with them though using this request form as each time I've tried it's been with a phone I purchased from the secondary market and then they reply that the details on record don't match mine. Congress recently approved a bill making it legal to unlock your phone and I understand the new bill also includes a provision allowing third-parties who obtain the phone legally to request the unlock code. So perhaps things will be easier for everyone when the new bill becomes law and takes full effect.
Oh, thanks, I'll try this out because I been googling stuff and I think I can get a code from At&t. Well hopefully.
I hope AT&T is cooperative. I am still able to go back to 4.1.1 on my SGS3 to unlock, but I never unlocked my Captivate - which is still functional. I keep it as a backup. It would be nice to have it unlocked.
How were you able to go back to 4.1.1? Right now im on 4.3 and people are saying not to downgrade or it'll brick your phone. All I wanna do is go back to 4.1.1 to unlock my phone and upgrade to 4.3.
I will be able to go back to 4.1.1 because I am still on 4.1.2. I never allowed my phone to take the 4.3 update.
Check out the captivate forum. You should be able to unlock it for free
Been perusing them for a bit. Not having much luck implementing for the moment. I think that is because I didn't have a sim in the phone. It's not a big issue to me at the moment. As a backup phone I don't actually need to unlock if I go with AT&T or even if I switch it to Straight Talk. Of course, it would need to be unlocked to use other prepaid options. Anyway, I subscribed to the threads I will revisit when necessary.
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