My iPhone 4S won't send text messages

My iPhone 4S won't send any texts, it says that it sent but my friend says he isn't getting any of them. Maybe just a few here and there can you please help! Maybe there's a type of reset I can do but I'm getting really frustrated because if it! Thanks(:

Added (1). Oh and he's not ignoring me because I also checked his phone when I sent a text and its not coming through just in case that what you thought.

Ok there are a few possible reasons and solutions, have you considered he does receive them all, but does not wish to reply to all of them? Text another phone repeatedly and see if they receive the messages.

If your phone is under warranty, send it to Apple for free repairs.

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