My IPhone 4 won't send text messages?

I have tried resetting the network settings, and doing a hard reset and my text messages still won't send, and I can't receive texts or calls. Anyone know what else I can do to fix this?

You need to get instructions from your carrier, since you did a hard reset some functions might not be working completely and need to be adjusted, they'll help you to enter the correct settings and make it work again.

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