Did you leave your T-mobile sidekick someplace?  IS your sidekick lost in your house?  No phone to use to call and find it?  Then wheresmycellphone.com is what you need. This is a totally free service that will call your Sidekick for you!  All you need to do is follow the ringing and find, and answer the phone and hang back up.  Whereismycellphone states that they don’t retain any records.

I tried it out and it works really fast.  It took about 5 seconds for my phone to ring after hitting the find button!