This guide also works with other Unlocked Blackberry Smartphones. Including the Blackberry Bold 9650, Blackberry Storm 9550, and other Unlocked Blackberry devices.

If your phone does not say sim card rejected when you place it in your phone, your device is 100% definitely unlocked! There is no such thing as a partially unlocked Blackberry phone. All features of the phone will work if you follow the instructions below. We have sold thousands of this model and the instructions below are guaranteed to work if followed correctly. AT&T and T-Mobile phone support, may not provide support for this device since it is technically a device manufactured for Verizon.

This is much simpler then it looks. Do not be alarmed :-)

In order to use this phone with any GSM SIM card you must do the following:

Step 1 - Press The Blackberry Button / Menu Button (Button with 7 silver dots that is next to green call button.)
Step 2 - Select Options -> Mobile Network
Step 3- Make Sure Data Services is Turned On & While Roaming is Turned On. 
Step 4 - Under Network Technology Choose GSM/UMTS -> Network Selection Mode: Automatic -> Network Mode: 2G (Note - The Storm does not work with AT&Ts 3G network)
Step 5 - Make sure Mobile Network is changed to whatever SIM card you have inserted. For example, if you are using AT&T, you would set the phone to "AT&T" here. 

Your phone should now work with your provider.

Having trouble with the internet browser or MMS on your Unlocked Storm?

We have found comprehensive instructions for using the Internet Service Books for AT&T and T-Mobile here - http://crackberry.com/how-effectively-run-your-unlocked-storm-north-american-gsm-carriers

This link provides service books for both T-Mobile and AT&T to download for free.