Replaced skitto SIM unavailable

Assalamu alaikum. Amar skitto SIM unavailable dekhano te Abar SIM replace Kori 20 din age. Ajke sokale SIM unavailable dekhano te onno phone e SIM dhukiye use kortesilam kinto ekhon SIM unavailable dekhacche. SIM onek phone e insert kore dekha hoyeche kaj hoy ni