How to unlock an iphone 4 from T Mobile to Vodafone?

My cousin has gave me his iphone 4. Unfortunately he's on T Mobile & I'm on Vodafone. My SIM won't work in it (I do have a micro sim) - so yes it fits.
What do I do?

Go to your nearest Vodafone shop & they can unlock it for you. They'll charge you a amount of money, though. T-Mobile charge £10 but that's only if you pay £20 or more per month.

You have to unlock your iPhone 4 before using Vodafone Sim. Use Remote Unlock method to unlock iPhone 4. This method is easy and safe. You can get Remote Unlock Service from http://www.onlinegsmunlock.com/apple-iphone-4/rs16wp9/ by providing information about your country and current Network provider.
After Unlocking the phone you can use your Vodafone Micro-Sim in it.

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