How to fix my iPhone problem?

I just recently downloaded iOS 7 and everything was fine, until i decided to make an iCloud so then i started to text my friends and they said an email appears instead of my number so i tried about everything to fix it, but when i went under message and when i was about to delete the email address my number showed up and i couldn't click on it because it was gray how do i fix this?

Try to reset your iPhone's settings. You won't lose any data you just will have to change your homescreen back to what you want it to be, the Wi-Fi will be reset and the backgrounds will reset to factory settings and if it is jailbroken the jailbreak will be gone but that is all that is really changed.

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