Here is the site that has detailed instructions to unlock your G1 android phone. If you contact tmobile after 90 days in service, it's free and if you use third party, there is a cost.

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"One of most important part in Unlocking G1 Phone is unlock code. You can get SIM Unlock code from T-mobile, in order to request SIM Unlock Code to T-Mobile Customer Care you need have active account for 90 days. Here is guide on How Unlock and Activate your T-Mobile G1 Phone."

How to Unlock and Activate T-Mobile G1 Phone

1. You can officially obtain SIM Unlock code from T-Mobile by Requesting Here. Or you can use Third party Service Unlock-tmobileg1.com which charges $23.99 USD.

2. Insert T-Mobile SIM Card in your G1 Phone

3. Now Press Menu Button and Switch on the G1 Phone using Power button. (Do not release menu Key)

4. Your G1 Phone should start in safe mode

5. Now Press Emergency Dial Button and Type *#06# Key. This will show you IMEI Number.

6. Provide this IMEI Number to T-Mobile Customer Care or to www.unlock-tmobileg1.com to get SIM Unlock code

7. Return to Main Screen Menu and Access APN Settings

8. A list of preset APN will be shown, you need to click on New APN button
9. Now Scroll down on New APN setting Screen and enter following details

MCC (Mobile Country Code), and MNC Mobile Network Code

Here is list of World MCC / MNC codes : http://en.wikipedia.org/wiki/Mobile_network_code

10. Now Switch off your G1 Phone

11. Insert Non T-Mobile SIM card which you have planned to use with G1 Phone.

12. Switch on Your G1 Phone.

13. A Prompt for Enter Unlock Code with popup, enter correct Unlock Codes whih you have received from T-Mobile. (Entering Wrong Unlock code more then Three time may permanently hardware lock your g1 Phone)

14. After Successfully Entering Unlock Code will activate your GPRS / EDGE / 3G Data Service will be active as per APN Setting .

15. Type Google User name / Password in Signing Window and this will Activate the Unlock G1 Device on your SIM Card.

16. Enter remaining Data Setting like MMS / Home Page / Port to Active other Data Service.

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Source(s):
http://www.blogsdna.com/2357/how-to-unlock-t-mobile-g1-phone.htm


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