It's rare to find one mobile phone on three different networks. When you do, there's typically some slight differences depending on what service provider carries it.

In Canada, the KRZR is available through Rogers Wireless (called 'K1') as well as Bell Mobility and Telus (both carry the 'K1m').

So what's the difference between the different versions? This post by Scott Robinson explains it perfectly. According to Scott, "you just need to decide what you're looking for more music or more camera."