The Motorola 601(T) was a fairly advanced phone for its time. It's not a very new phone, so although it had many features, it still has several glitches that can be exploited. They do not do anything, they are just for fun. Here's how to glitch the phone book (no effects are permanent).

[edit] Steps

Open your menu and navigate to Settings > Other Settings > Initial Setup.
Set "Animation" to "on" and "Scroll" to "Wrap Around".
Open your phone book.
Scroll to the bottom 3 entries (including "New entry").
Quickly alternate pushing the up and down keys as fast as you can.
After a few seconds, just push the down key rapidly. The highlight should stop and the "View" option should disappear.
Push the menu button, then back. You should be at the top of your phone book with no contacts. Just move the highlight and your contacts will snap back.