Buying a used mobile phone and want to check if it’s ok to buy and will work on your network?

Some quick tips:

1. Verizon will not allow ATT iPhone 5s and below to work on their network

Check if phone will work on

Verizon: https://www.verizonwireless.com/prospect/bring-your-own-device/#/checkDevice

ATT: https://www.att.com/shop/wireless/byop.html            OR         https://m.att.com/shopmobile/wireless/byop/checkIMEI.html