I have a locked AT&T iPhone 3g with the standard $30 a month data plan. If I use one of those programs such as ziphone to unlock my phone would I be able to put the sim card from my iphone into a blackberry? I did a bit of searching and most people are doing it the other way around putting a blackberry sim into an iphone. My main reason for doing this is that blackberry has an etrade application that I desperately need. Any help would be greatly appreciated.