Can I use a Blackberry Sim for a Sidekick or T-Mobile phone, or where can I get an inexpensive cool phone?

T-mobile blackberrys can hold a T-mobile sim card. Any AT&T blackberry can hold a T-mobile sim card. However the AT&T blackberry must be unlocked in order for it to work on T-mobile.

If you find another blackberry phone that is from another provider it must be unlocked as well and run on GSM network. There are the Blackberry 8820, 8900,9000,8310 and 8110.

 Cell Phone FREE w/ Contract + Free Activation on T-Mobile.

No data plan required. Wirefly is offering the Nokia Nuron 5230 cell phone which features a 3.2" touch screen display. It has all the smartphone features you'd expect, but without the more expensive monthly data plan. Its attributes include 3G speeds, a GPS (free turn-by-turn navigation), email, media player and 2MP camera/camcorder. Stereo headphones, 4GB MicroSD memory card and guitar sharped stylus included.