How to unlock Sidekick
How to Enter Unlock Codes on Sidekick/Hiptop Cell Phones (all models):
1. Insert a SIM card from a different network provider and turn on the Sidekick. A dialog screen comes up, prompting you for the code.
2. The box will say:
3. In the upper right hand corner, the SIM is flashing where the signal strength should be. On entering the code, a dialog box comes up saying authenticating code. It’s unlocked. Enjoy.
In case you see the “Waiting for Activation Screen”, hit the menu key and the letter L key at the same time. If you have a Sidekick 3, use the Del instead of the L key. The menu key is the top left key. By doing this, the waiting screen will go away and you will be able to make calls. For best results, hold down Menu and the L key until the Waiting for Activation screen disappears.