Changed phone carriers today. My 4s gives message "SIM Not Valid". Former carrier says phone is unlocked. New carrier says new connection successfully ported across. Help!

Changed phone carriers today. My 4s gives message "SIM Not Valid". Former carrier says phone is unlocked. New carrier says new connection successfully ported across. Help!

Reset your network settings
remove your sim and insert it back in
switch it off and try it again
If none of these work i suggest you call up your network operator

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