changed my 'message centre' number and now sms will not send.? S2 galaxy note.
I changed my 'message centre' number in 'message settings'
and now sms will not send.?

also, Searching for WHY MOST address book contacts do not show an icon for incoming sms…?
Vodafone shows up on the inbox.. but not many other contacts.?
help please
I changed my 'message centre' number in 'message settings'
  and now sms will not send.?


The answer is trivial. You need to contact the customer care support of your network provider. Depending upon their procedure they may ask few questions, and after confirmation you can ask them then default Message Centre Number. Enter it at the same location where you changed it, restart the device if required and you now will be able to send SMS again.