I know I'm not the first to ask and won't be the last.

Someone I know is considering getting unlimited mobile broadband service in the US. They want to be able to get on the net whenever and wherever they need to (don't want to have to serach out the nearest wifi hot spot).They have looked at Sprint, AT&T and Verizon. Whom do you use and why? Are there others they need to check out? Unlimited Service prices run $59 - $79/month and cards start at $9.95 (Sprint is having a special I guess) and average about $49.

OK, fire away!