I am currently with SPRINT PCS waiting/hoping/wishing/praying for the BB 87xx to arrive... but I am willing to switch/change carrier... of all the US wireless carriers who provides THE best BlackBerry (BIS) service?

Do you mean the best from a customer service perspective, or the best from a device perspective, or the best from a cost perspective?

The best one is the one that gives you the best coverage where you are going to be using the device. I would LOVE an 8700g from T-Mobile, but I don't have coverage where I work or where I live, so that doesn't make it the best for me. For me, the best if Nextel since we have the iDEN signal amplified into our facility (oh, and because the company pays my bill

The best Blackberry service... in my case (area) all carriers have coverage.

I have been with T-Mobile since 1999 on numerous phones and plans and now I'm on their Blackberry plan with a 8700g. I have to say I am pretty pleased. In fact, I do not have any major issues with them at all. Their customer service is decent. You get to talk to people who give you good advice. I also recently found out that T-Mobile is offering pushed e-mail in conjunction with Yahoo! Mail. Cingular doesn't according to users on this forum. That alone would be a showstopper for me. T-Mobile's T-Zones stuff I could do without, and also that they push bookmarks for the browser that you can not get rid of, but those are minor issues in my opinion. Coverage is good where I am mostly traveling (major US cities and all over Europe). Being an European living in the US I have to say that T-Mobile is very much like the European carriers I used before coming here (maybe because they are German owned?).

So for me it has been, and will continue to be, T-Mobile.

//C

I think juwaack68 said it best, whichever carrier works for you, is the best one. For me here in New England, its Cingular.