I have used a T-Mobile h6315 for 4 months but had it enough... Back to two devices. Gotta have a separete reliable cell phone! My new hx4700 is great but i cant say how it is superior to h6315 since they are in different leagues. Bottom line is i am happier.
As long as you dont push its limits h6315 is a great device. Jabra might be an exception but BT works great to. I used Belkin Headset and GPS with it. It worked nice. The biggest problem is lock-ups associated with the programs you install or system related stuff... It is a big unknown. Needs updates but nobody is willing to develope one in the near future. (TMO guys need to get trained first... they willl learn to code and will provide you an update in the near future

) Oh one more: YOU MISS CALLS WHEN USING GPRS... HELLLLLLLLOOOOOOOO... T-MOBILE? or should i say Catherine Zeta-Jones?