Is it possible to unlock a iphone4 to any network?

I want to get a second hand iphone online but it is not unlocked. When i get it is it possible to take to a sotre to get it unlocked? Or can't you unlock iphones?

Depends what Carrier is it. I unlocked iPhones.

Message me if you want me to unlock it

Yes, it is called factory unlocking. There are many providers who will do many carriers like http://www.iphoneunlockedcheap.com

Hi, you can unlock your Iphone 4 by using Remote unlocking service. You can get this service at affordable cost from http://www.prounlocking.com/apple-iphone-4/rs8wp9/ .Here they are using latest version of iTunes software. It is safe and secure way for unlocking your Iphone 4. After unlocking, you can use it with your service provider.