i purchased a prepaid att phone in box with all the creditials and its telling me when i try to unlocck this device that i have to get the account own

Hello,Just a little background before I ask my question. I am a Canadian citizen, but travel a few times a year to the Philadelphia, PA area to visit

i want to deactivate sim cards (Phone number hidden) & (Phone number hidden)

I'm thinking about getting the 1-year 8GB prepaid plan, does anyone know if I can use a few prepaid cards to help pay for the $300?

These codes appeared on my bill... ICO-DE8-1010ICO-DE7-7453...1code141020053...ICO-DE2-5156. Could you please tell me what they mean???

Can someone please tell me where the code ICO-DE9-5819 comes from. I know it's a short code but to what?????

I received a text with this  1C0-DE4-5566 after friend used my phone, what does it mean?

Looking at my att account history it shows a text code of 1C0DE32665, what is this for?

My phone is telling me my mobile network is disconected how do if reconnect it

I have a Samsung J3 Luna pro that was never activated (It's a Totalwireless tracfone) & now I am trying to activate a AT&T Prepaid sim... this is my f