Okay first let me say it's a iPhone 6S T-mobile Plus 128GB I contact Tmobile maybe 2 or 3 months ago to get the phone unlocked. After about 2-3 days later it was unlocked. I used Verizon and Tmobile all the time I switch my sim out with no problem. I just got my 7 plus and I backed up my 6s plus then did a facotry reset. (No I mever jailbroke this device) after the phone turned on I pop in my Tmobile sim and just let the phone sit there for a few days, so today I went ahead and put in my Verizon SIM card and get SIM no support message... how is that even possible I've used the Verizon SIM card on that phone before. If anyone have any information thanks in advance.