How to unlock the RIM Blackberry Pearl 8220 flip

easy 12 step to unlock your phone: 1. Hit the menu button 2. Scroll to and select the Manage Connections icon. 3. Select Turn All Connections Off. 4. Press the red End key. 5. Scroll to and select the Settings icon 6. Scroll to and select the Options icon 7. Scroll to and select Advanced Options 8. Scroll to and select SIM Card 9. Enter MEPD Note: When Typing in MEPD the letters will not appear on the screen. This step opens up the personalization on the device. Notice under Network, it will say Active. 10. Enter MEP2 (For "2?, press the ALT key then 2) Note: When Typing in MEP2 the letters will not appear on the screen. Notice the Enter Network MEP code box. 11. Enter the Unlock code (This is a 16 digit code) 12. Press the Trackball or Enter key (once one of these keys is pressed the device should display "Code Accepted.")
The phone has been successfully Subsidy Unlocked is you see in the display next to Network Disabled

*The 16 digit code can be obtained by calling your Mobile Operator's Technical Support and give the representative the IMEI number. In exchange they will give you the Subsidy Unlock Code.
Not all Mobile Operators give away the unlocking code though! alternatively, you can try unlocking providers - check this one here

How to Enter Unlock Codes on T-Mobile

1. Press the Menu key.
2. Scroll to and select Manage Connections.
3. Select Turn All Connections Off.
4. Press the red end key or the Escape key to go back to the Home screen
5. Scroll to and select the Options icon.
6. Scroll to and select Advanced Options.
7. Scroll to and select SIM Card.
8. Type MEPD Note: When typing in MEPD the letters will not appear on the screen. This step opens up the personalization on the device.
9. Hold down the Alt key and type in MEP2. Note: When typing in MEP2 the letters/number will not appear on the screen. This Step opens up the Enter Network MEP code box.
10. Enter the unlock code.
11. Press the trackball (code accepted should display).
12. Press and hold the red End key to turn the handheld off and then back on.
13. Once the device has powered on, follow steps 1 & 2 and select Restore Connections.
    

Not necessary ...to unlock the device get the network unlock code from service provider, call them and tell them you want to unlock your phone because you are going overseas if they ask, but they won't and they will unlock it for you. They will send you the code to do it. here is the way you can unlock the 8800, which I used for my phone. Just get the code from service provider 1. Press the Menu key 2. Scroll to and select Manage Connections. Select Turn All Connections Off. 3. Press the red end key or the Escape key to go back to the Home screen. 4. Scroll to and select the Options icon. 5. Scroll to and select Advanced Options. 6. Scroll to and select SIM Card. 7. Type MEPD Note: When typing in MEPD the letters will not appear on the screen. This step opens up the personalization on the device. 8. Type MEP then hold ?ALT? key and type number 2. Note: When typing in MEP ATL 2 the letters/number will not appear on the screen, this step open up the ?Enter Network MEP? box. 9. Enter the unlock code. 10. Press the trackball (?Code Accepted should display) 11. Press and hold the red End key to turn the hand held off and then back on. 12. Once the device has powered on, follow steps 1 & 2 and restore connections.

Follow the instructions mentioned by marbleann & get the code from unlock4u

Setting up MMS
The WAP will need to be setup before MMS can be activated. Please follow Setting up WAP
guide before MMS.
1. From the main display press the left select key under Menu.
2. Scroll to Messaging and press the left select key under Ok.
3. Scroll to Settings and press the left select key under Ok.
4. Scroll to Multimedia Message and press the left select key under Ok.
5. Scroll to Network Profile and press the left select key under Ok.
6. A list of profiles will be displayed, press the left select key under Options.
7. Scroll to Add and press the left select key under Ok.
8. Profile name will be displayed, enter Vodafone MMS and press the left select key under
Ok.
9. Scroll to the New Vodafone MMS profile and press the left select key under Options.
10. Scroll to Settings and press the left select key under Ok.
11. Scroll to MMSC and press the left select key under Ok.
12. Enter http://mms.vodafone.co.uk/servlets/mms press the left select key under OK.
13. Scroll to Internet Mode and press the left select key under Ok.
14. Scroll to WAP and press the left select key under Ok.
15. Scroll to Proxy IP and press the left select key under Ok.
16. Enter 212.183.137.012 press the left select key under OK.
17. Scroll to Proxy Port and press the left select key under Ok.
18. Enter 8799 press the left select key under OK.
19. Scroll to Connection and press the left select key under Ok.
20. Scroll to Vodafone GPRS and press the left select key under Ok.
Note: If there is no Vodafone GPRS settings please follow Setting up WAP guide.
21. Press the Right select key under Back.
22. Scroll to Vodafone MMS and press the left select key under Options.
23. Scroll to Activate and press the select key under Ok.
Once you save the settings for MMS then the settings for GPRS are given below:
Setting up GPRS
1. From the main display press the left select key under Menu.
2. Scroll to Settings and press the left select key under Ok.
3. Scroll to Connectivity and press the left select key under Ok.
4. Scroll to Network and press the left select key under Ok.
5. Scroll to Network Profile and press the left select key under Ok.
6. Scroll to Data Connections and press the left select key under Ok.
7. Press the left select key under Options.
8. Scroll to New Profile and press the left select key under Ok.
9. Scroll to Name and enter Vodafone GPRS
10. Scroll to Bearer and scroll left/right to GPRS
11. Scroll to APN and enter:
For PAYT customers: pp.vodafone.co.uk
For Contract customers: wap.vodafone.co.uk
12. Scroll to Use ID and enter wap
13. Scroll to Password and enter wap
14. Press the left select key under Ok.
15. Press the Hangup key.
16. From the main display press the left select key under Menu.
17. Scroll to Browser and press the left select key under Ok.
18. Scroll to Settings and press the left select key under Ok.
19. Scroll to Network Profile and press the left select key under Ok.
20. A list of profiles will be displayed, press the left select key under Options.
21. Scroll to New Profile and press the left select key under Ok.
22. Scroll to Name and enter Vodafone WAP
23. Scroll to Homepage and enter http://live.vodafone.com
24. Scroll to Proxy and scroll left/right to On
25. Scroll to IP Address and enter 212.183.137.012
26. Scroll to Port Number and enter 8799
27. Scroll to Access Point and scroll left/right to Vodafone GPRS
28. Press the left select key under Save.
29. Scroll to the New Vodafone WAP profile and press the left select key under Options.
30. scrollto Activate and press the left key under OK.
if it asks you for a PIN. The PIN is 1234.