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As Ween pointed out, The Strom gives you the ability to use the Blackberry SureType technology (best way to tell this: multiple letters on a single key on the keypad) or traditional Qwerty technology (a single letter, along with a number or a symbol on each key).
Thus far, the Storm is the only Blackberry that will allow you to choose between the two.
Other Blackberrys with the multiple-letter keys will be SureType, Primarily the 8100 and 8200 series) while most other Blackberry models will be Qwerty.
It took me about a week to get used to SureType, and I really don't have a strong preference either way, but you will find in if your read through some of the threds here that many have strong prefernces one way or the other.
1st Step in Troubleshooting: Do you have a BlackBerry Data Plan?
2nd Step in Troubleshooting: Pull the Battery.