Sprint and black berry here! I am having double thoughts about it. I am looking to get a different phone when my chance to comes to change my phone. I haven’t had any trackball issues, but I have had my phone lock up, then also send out a ton of trash emails, because some how someone hacked my email account and sent it from my phone. not sure what I am going to get into next, but I am sure it will be some kind of or version of a blackberry. I also have went from using hte phone internet to using the chettah hot spot from sprint, I like it, its a little bit slower than cable, but a touch cheaper.
just my .02 worth
shane