My friend is buying a Verizon iPhone SE from verizonwireless.com and giving it to me. She can't use it because she still has unlimited data and is only using the 2-year contract upgrade for other reasons. Once she takes delivery, she will not power on the phone, then she will take the Verizon SIM card out and burn it. I have AT&T and T-Mobile(prepaid). If I pop either of those SIM cards in that iPhone SE and activate it, is there any danger of the phone being locked to either of those carriers? I've been reading posts here and there about that happening to people who bought iPhones from Target. Just wanted to make sure that it can(or can't) happen when the iPhone is acquired directly from Verizon. Thank you for any information on this.