I'm currently on AT&T, and I have the chance to purchase a T-Mobile Micro Sim Card.
Does unlocking the phone mean I'll be able to get 4.1.2. since I'll be on T-Mobile's network?
Long story short I'm trading my Galaxy Nexus for a T-Mobile SGS3 and I want to know if the phone can be unlocked and function on the att network, data and all. I've seen some discussion about the unlocking process and it involves unlock code websites that seem sketchy.
I have decided to go ahead and go with a note 4 and since I like customizing the rom I am going to get a t-mobile note 4 to use with att. I will buy the phone up front and then I plan to use an online service to unlock it right away. Since t-mo won't sell the phone without a plan I was looking at the cheapest plan I can get with this phone.