My iphone 4s isn't sending my text messages, or my calls?

I've had my iphone for maybe a couple of months, and its not sending text messages, and my calls arent going through. They were earlier but now my text won't send, and my calls won't go through. I've shut off my phone for a while, and turned it back on, and i reset the network system. I don't know what else to do, help?

If this happens, then check this troubleshooting guide… Http://support.apple.com/kb/TS2755

  • Why isn't my new iphone 4s sending messages? I have had my iphone for about 2 and a half weeks and ever since i bought it it hasn't sent messages right… I have tried to reset it and i looked at imessage and made sure everything was right on that and it still won't send messages half the time… Plus i can't get incoming calls sometimes i will have to call the person thats trying to call me… Should i take it back to c spire or what?
  • Why isn't my iPhone sending text message? So my iPhone won't send TEXT messages. IMessage works. Other people can send me text messages but whenever I try to send a message, it says "message failed to send" or something like that. I have lycamobile carrier and nothing like this has ever happened. I have restarted my phone and all of that. I changed nothing in settings.
  • Why isn't my Iphone sending picture messages? When i try and send picture messages my iphone says message send failure? Also, 3g isn't working.
  • Why is my iPhone5 sending some messages as iMessage and others as Text Messages? I understand that messages are sent as Text Messages when there's no signal or poor Wi-Fi connection. However, I'm successfully texting some people using iMessage but others (still iPhone users) as Text messages. The other person will send iMessages and then my responses will be sent as green Text Messages.