Can I use my Blackberry contract on an iPhone?

I have the Blackberry Voice and Data plan which is 50 a month. I was wondering if I could take the sim card out of that and put it in an iPhone 3GS and everything will work alright, or is the data plan not compatible or what not.

Its not compatable… The data may work, but it will be severely buggy/latent/glitchy at times… Or it may not work at all… Depends on the APN settings… Go on and try it and see if your sanity can put up with the buggyness… But don't cry and complain in a few days when it doesn't work

You have a regular phone and data plan which also includes BlackBerry data.

It will work equally well in any smartphone which accepts a standard sized SIM, but you will lose the use of the BlackBerry data functions (basically, BlackBerry Messenger) and so should call your network provider to cancel that part of the deal. In the UK that reduces your monthly cost by £5 and there's a similar charge in other currencies worldwide.