I have been with T-mobile for 3 years now, and have been very pleased with their service. My previous phone was an older model flip phone, the Samsung E105. I have been very impressed with that phone. My review of the t519 is based on only 5 days of usage, so keep that in mind.Positives:- Nice, sleek looking phone- Very nice, bright screen- Extremely light phone, hardly noticeable in my pocket- Battery life seems very good- Reception in my area is good, no dropped calls in the 5 days of usage- MP3 player- Expandable memory (Micro-SD memory Card slot)Negatives- Akward to hold, seems almost too thin, feels like holding a credit card.- No way to customize the 4-way directional button- Camera button not very reponsive, takes multiple presses to activate the camera- Can't check time without 'waking up' the phone (this is one feature I miss from my clamshell phone, but if you are used to candy bar phones, probably not a big issue)- No stero headphones included, only single earbud. I really haven't had an opportunity to hear how good this little phone sounds because I only have the mono earbud.- Speaker phone feature is not very good. My wife said that I sound like I'm in a swimming pool when I talk to her on speaker phone.- Volume could use a little more of a boost for the loudest settingI have not tried the bluetooth, so can't comment on that. All in all, I think I will return this phone and pick up a different one. The main reason being that I prefer clamshell phones to candy bar ones. This may be the phone for you if you prefer the candy bar type.