I was in my local T-Mobile store today getting my sim replaced. (my 270 lost connection out of the blue, ended up being a bad/fried sim. I had it since my Visor Phone, RIP sim card) Any way, the rep I was dealing with asked me how I liked the 270, my responce was Great! Love it, but I can't wait to get my 600. He in turned said that T-Mobile was testing it down in Dallas and that is was not testing very well. He could'nt elaborate, for what ever reason, but that was his information. I hope that poor or weak testing does not affect the release of the 600 for T-Mobile. I am thankful that my 270 is still alive and kicking, and flipping and back lighting!!!!!!