So I was thinking of grabbing a blackberry from ebay just to try out. I may also end up snagging some android device when they become more readily available on AT&T. I currently have an iPhone. Is there any easy way to potentially switch between the iPhone and a blackberry on a day to day basis? I'd like to be able to swap the sim card and use the blackberry for a day, or take the iPhone, whatever way. The iPhone will be the one getting the most use. But just to mix things up I'd like to use a blackberry. Will this work? If so what might be problematic? I realize visual voicemail is an iPhone only thing. So that obviously isn't a problem really for me. Tips, suggestions?