How to find option for inserting' Message Center Number' (code) on Iphone 4G

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).
Michael MurphyAsked:
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Michael MurphyAuthor Commented:
I have sorted out this problem myself. Got no reply from Experts Exchange. I googled the problem and got plenty answers, giving me the code to dial the network. When I dialed the code I got an immediate answer telling me the Message Center Number to which I was attached - which happens to be the correct one. So my problem (in not being able to send texts - though I can receive them and can  also make phone calls) remains. I will put it to Experts Exchange in a separate question.
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Michael MurphyAuthor Commented:
Sorted it out myself. Found the answer by googling the question. Got no answer from Experts Exchange.
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