Using SIM Lock on Dell Streak

The SIM card will be permanently locked if you enter the incorrect PIN three consecutive times. You must then enter the Personal Unblocking Key (PUK) to unlock the SIM card.. Please contact your service provider to obtain the PUK. You can make emergency calls without unlocking the SIM.

1. Touch the Home button and then the Menu button . 
2. On the menu, touch Settings, Security & location, then Set up SIM card lock and Lock SIM card.
3. Type your SIM card PIN using the on-screen keyboard and then touch OK.

To change the SIM card PIN:

1. Touch the Home button and then the Menu button . On the menu, touch Settings, Security & location, then Set up SIM card lock and Change SIM PIN.
2. Type the old SIM card PIN using the on-screen keyboard and then touch OK.
3. Type the new SIM card PIN and then touch OK.
4. Type the new SIM card PIN again and then touch OK.