Some weeks ago I had the same predicament with a 3Gs locked on a UK network. I looked for someone to do it and they all said it was not possible. Then I got one guy who was going to do it but the kind of money he was charging was enough to get another decent phone e.g an Android. So I gave up and decided to tackle the problem like a techie would...on my own. Downloaded some files of the internet to be used for unlocking and then I took the risk. My reasoning was simple, if I can't use the phone on Kenyan networks then it was no longer useful to me and I could bear the price of ruining it without guilt in my heart. 2 hours later I put a Safaricom sim inside and I was welcomed by full bars! Moral of the story....take the risk on your own...or forget about it all together. :)
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Kind Regards,
Moses Muya.