I have an Xperia Mini Pro (SK17i) and cellunlocker.net said they unlock it easily. I paid the $39.99 (£26.41) as the guy in my local shop charged £35 and said that was the cheapest he could do it for legitimately and anyone else offering to do it for cheaper were probably using pirate software or were just trying to blag/cheat me out of my money and he had seen it a few times from people with damaged and still locked phones from cellunlocker.net.
I ignored the warning and used cellunlocker.net and they could not unlock my code or even supply me with the manufacturer's code like the man in my local shop.
They took my money and could not unlock but I thought Paypal and their 100% guarantee would cover me. They ignore my emails and bother replying when I am asking for a refund.
I feel that all the reviews on the reviews site by people called John, Jane, $#*! and Tony etc are all fake people they have made up to try and create the impression they have had given good customer services.
I would never use them ever again and urge anyone not to use them but instead use their local store/shops.
They speak broken English and would have you believe they are in the USA but I could tell from the time of their responses and they way they write emails they are not in an English speaking country.
To date I am still awaiting a refund. Bloody Scammers!