I had many problems getting my phone unlocked from the UK orange network so that I could make cheap calls on a thai sim card. After getting conned on the internet and after three attempts at different places in Hua hin I found a very good engineer at work who put a new chip in my phone and repaired the ear peice speaker for 1000 baht.
So if anybody here is as frustrated as I was and has phones to unlock or repair please let me know i'll be happy to translate to Kun Chan in thai exactly what you need. He doesnt ask for money until its fixed and you say its fixed which is a first for me!
James