I can't send and receive text messages

There's an error at the receiving end

Send a text message to another number to check if the error is at the receiving end.

1 of 8 steps Press Messages.
2 of 8 steps Press the new message icon.
3 of 8 steps Key in the first letters of the required contact.Matching contacts are displayed.
4 of 8 steps Press the required contact.
5 of 8 steps Press Enter message.Write the text for your text message.
6 of 8 steps Press SEND when you've finished your text message.
7 of 8 steps Press the Home key to return to the home screen.