A:AnswerThe Samsung Galaxy A20 is compatible with the following phone carriers: AT&T, Cricket, H2O Wireless, MetroPCS, Mint Mobile, Net10, Simple Mobile, Sprint, T-Mobile, TRACFONE, Total Wireless and Verizon
A:AnswerHello Abeni, the Samsung Galaxy A20 is not a dual SIM mobile device. The specifications indicate that the SIM slot type is SIM 1 + MicroSD (512GB). Thank you for reaching out to for clarification. We appreciate your time and for being a part of Samsung! ^Liz
A:AnswerDid you try calling your cell service provider? If you bought the phone and it was for At&t but you have boost money obile service then that would mean the sim is locked to At&t only you would need an unlocked phone to use other services on it... just an assumption of what your issue could be.