IPHONE 4S CALL FAILED WHAT CAN I DO TO FIX IT?

IPHONE 4S "CALL FAILED" WHAT CAN I DO TO FIX IT?

Added (1). Basically Everytime I try to call anyone it beeps and says called failed on the screen. I have payed my bill thanks. I don't know how to fix it I can receive calls just not make them or send texts which is awful my iPhone is the 4s x

It's a problem with network/ SIM card
May be a bit more info? So we can help you better?

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