Replying to unlocking cell phones

My dad is coming to visit me in Thailand but he's scared shitless of being away from his cell phone. I dont want him using mine, so I thought he should bring his own. How do you unlock them? I know there's websites that charge money, but I'm just looking for a free service. I'm sure it's just a computer key generator that you plug some numbers into and it spits out a code, but I really dont want to pay.

A phone number here costs like 5 bucks (seriously, I have two numbers) and so this would just be way easier. Anybody have a website they can hook me up with? Thanks
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'I've been so unlucky today. Honestly, if it was raining pussy, I'd get hit in the head with a 12 inch dick. God is angry with me.'
-Anathema

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'girls are cruel and unusual, like pouring acid into a cat's ear'
-NoTeefa