My iphone won't send messages

I have owned an Iphone 4s for not even a year and its worked pretty well in sending messages but for some reason it just suddenly stopped sending messages. Its been like this for two days now and the only person it will send messages to is a friend who owns an iphone(all my other contacts own samsungs and other phones) so i figured messages only send to her because she owns an iphone. So I don't really know what to do in this case.PS the messages I try to send just keep trying to send for a long time. They never stop and say failed to send, they just keep going even if i'm at a place where I have a decent amount of service. So i'm not sure what I can do.

Maybe you need to reset your message settings or check if i msg is switched on/off. Or try a reset, also check if you got credit

Try seeing if other people that use the same cell phone company as you have the same problem, try turning your phone off and then turning it back on, turn imessages on and then back on or see if you turned the sms off if it is turn it back on

That sucks

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