Can I swap my sim card from a htc smartphone to an iPhone 4s?

I was looking into buying an iPhone 4s. I was just wondering if I took the sim card out of my HTC smartphone (note I'm not on a data plan and use virgin mobile) can I put it into an iPhone that I bought from someone who is using bell. I do believe that it is interchangeable for virgin mobile and bell. I was just wondering if this would be possible?

I'm from the UK so don't really know the difference between your networks but even if you can't just put your sim in you can always get the phoned unlocked.
But do bear in mind that you will need to have your sim card made into a micro sim or you will have to ask your service provider to change the sim card for a smaller one.

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