Why iphone 5 can't send messages?

Please READ DETAILS (when you don't read you may give a solution i already tried)
its been about a month since i've had the iphone 5 (with Verizon) and I only recently had this problem where it can't send messages or sms texts. I have great internet, great service, and all my settings are fine. I have tried restarting it but it doesn't help at all.

Please give any and every possoble solution to this problem.

Go to settings, messages, make sure imessage is on. Once you have done that check that at the receive at icon it has your mobile number. If not go back into settings then phone and in the my number field type in your mobile number starting with + and your country code. Don't type the first 0. Hope this helps.

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