Is it possible to unlock my iPhone 4?

I live in Ontario, Canada. My carrier is Rogers. I have an iPhone 4, white, and my friend who is on Bell would like to buy my phone. Obviously, I need it unlocked for him to be able to use it. My question is; Is it possible to unlock my phone so he can use it with a Bell sim card, and also, I have been looking at the Gevey Sim Card. Would that work? If so, which model?

I'm not sure about Gevey SIM card as i have never used it. I recently unlocked my sister's iPhone 4 using remote unlocking service. Using this remote unlocking service i unlocked the iPhone 4 from just being at home through online. It was very safe and simple. I got the remote unlocking service for the iPhone 4 from http://www.theunlockarena.com/apple-iphone-4/rs16wp9/ at affordable cost with free unlocking instructions. You too can try with this service to unlock your Rogers network locked iPhone 4. But note the point that you can unlock a GSM network locked iPhone to use with any other GSM network only.

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