I was instructed by Customer Care (MTN, Nigeria) to enter the Message Center Number on my Iphone 3G.
I cannot find on the phone where I can do this. Customer Care say there should be an 'Option' to do this. So can you advise me how to locate this option so that I can enter the number 234803000000. (Reason for wanting to do this is because text messages which I send are 'not delivered' and it seems the Message Center Number must be wrong).