This is the first cell phone I've owned, and overall, I am quite pleased with it. I purchased this phone after researching many different phones, mostly Nokia's that were T-Mobile compatiable. Among my requirments for a phone were: good screen, decent camera, bluetooth, and GPRS support. The 6600 was the best phone I could find with these options that I could get with t-mobile.One primary reason for getting a cell phone was so that I could use it as an internet connection for my laptop running linux, where softmodem drivers are hard to find, and don't work very well. If you are using Linux, and you want to use GPRS to connect to the net, I suggest this phone along with a Belkin USB Bluetooth adapter.For the linux users out there who are intrested in my setup:I'm running Debian (Knoppix 3.4) with a custom 2.6.7 kernel.On a DELL Inspiron 8200 with a P4 2.0ghz system with 1gb RAM.The KDE Bluez system for bluetooth support.I have really enjoyed the camera on this phone. Although the images are not the best in the world, its very handy to have a camera everywhere you go. And the phone has a very cool feature wich allows you to send images via a normal POP3/SMTP e-mail account. I will also say that setting up the e-mail account was very simple and straight-forward, although you do need an external SMTP server to use.The phone can use any MIDI audio file as a ringtone. Which is really nice because you can get pretty much any piece of music in MIDI format for free on the net. You can use the OBEX File Transfer service with bluetooth from linux (KDE-bluetooth provieds a nice intergration into Konqueror for this) for sending files to the phone.The fact that you can assign ringtones to people and/or groups is really cool. Apparently some phones don't allow you to give an entire group a ringtone.I will say that the OS that the phone runs does have a few issues. Sometimes, various applications crash. Especially the bluetooth server... Meaning you have to restart the phone if you want bluetooth to work again. This is somewhat annoying, but from working with computers (espcially windows -- ugh...) I'm used to having to restart things. On average, I prolly restart the phone every two days.I use this phone exculsivly with a Jabra Freespeak 250. I really dislike holding a phone to my ear, and I've found the Freespeak to be very comfortable and easy to use with this phone. The only main drawback is the fact that the voice-dialing system is kinda picky. It takes a while to learn how to use it right, and at this point I am able to make about 70% of my calls using it. However, it needs to be quite quiet for it to work at all -- dosn't work at all in the car, for example.Some people have commented about the size and weight of the phone, and it has rightfully gotten the nick-name "the bar of soap" which, it really is. But if you use all bluetooth accessories, as I do, its really not an issue.All in all, this is a great phone. Especially for the price amazon gives it at (I was unable to get mine through amazon due to some credit complications). If you use linux and want GRPS and/or want to use a handsfree bluetooth device, and want a decent camera -- this is the phone for you.