I have owned this T610 for almost 6 months now. Initially I was impressed by its sleek look and colorful features. But as I got acquainted with its functions, I wasn't so glad anymore. This phone has serious technological flaws. It would change my time zone anytime even when I wasn't traveling to a different time zone. At one time my battery would show almost half life and then within 20 mins it would give me a "low battery alert" - that too when I had hardly used the phone for 3 months. My voice messages would reach me after a few hours (at times next day!). There would be 3 signal bars and then too I would have problems listening to someone who was talking form a land line. At times the phone would just freeze (like Windows products!!) and I would have to restart the phone.I explained these problems to T-Mobile and they promptly replaced my old T610 with a new T610. But the problems persist - esp. the battery and freezing problems.This is the first time I am using a Sony Ericsson and believe me it's the last time too. I have used Nokia, Motorola, Samsung and LG phones earlier and I never ever had such technological problems with the phone instrument.As for T-Mobile service, its awesome. I would strongly recommend T-Mobile only if you were not to use this T610 instrument.