My sister give me her t mobile HTC g1 google phone after she brought herself a new phone. the problem im having is that her personal info is still attached to the phone under her google account that has all her contact imformation stored. I would like to store my own personal information, but every time i delete her contact information, it also deletes information off of her new phone.

Hi, You need to provide your mobile's IMEI number, country and Network carrier details to unlock your mobile. It'll be helpful to find the availability of the service. Give those details and unlock your HTC G1 at TheUnlockArena.com . Here they provides you unique unlock code for your mobile with step-by-step instructions.. Hope it helps you..

you can Unlock your HTC G1 with imei unlock code. it is very simple and eaisiat way to unlock your HTC G1. get your HTC G1 Imei Unlock Code . and use any gsm sim card.
i hope this will help you .

Open Menu
Choose Settings
Choose Applications
Choose Manage Applications
Select the application called "Google Apps"
Select "Clear Data"
After a little while a notification will popup in the status bar prompting you to se up your Google account info
Enter the new Google account information
Reboot the cellphone

Please be aware you will lose info that is usually synched to Gmail such as your contacts and calendar information!

As an alternative to the above procedure consider doing a "factory reset" (not described here).

Go to settings > privacy > Factory reset that will turn it back to stock info and you will have to see the tutorial again and put in your gmail information

To unlock the Mobile so many method available ....But they leads to Data lose....Unlock code is Best Method..they are safe method...I used the Code to Unlock my mobile,....You can get the unlock code here http://www.theunlockspot.com/htc-g1/rs10wp9/ to Unlock Your Mobile from the Network lock....
You check for your locked Network it's Country also.

HI FRIEND ITS YOUR ANSWAR
Overview In today's fast-paced world, it's easy to lose track of the really important things in your life. Your social calendar is just a bit out of synch and friends are just a bit too far out of reach. Until now... The T-Mobile G1™ redefines what it means to be kept in the loop.
Feel the exhilarating power and freedom of having all the communication tools you're used to in your hand. Mobile Internet services are at your disposal with quick one-touch access to Gmail™, YouTube™, Google Talk™ and Google Calendar™. Explore even more of the world with detailed street, traffic and satellite views via integrated Google Maps™.
Dazzle your friends with the large sensationally crisp 3.2" display. The touch-sensitive navigation is finger friendly and super intuitive but you can swing it out of the way to use the full five-row QWERTY keyboard. There is plenty of room to respond to emails, messages and even chat.
G1 delivers an extraordinary browsing experience. The G1's browser comes with a clever multi-page window pane; it lets you surf multiple websites at the same time. Drag the page around with your finger to pan, or move from one link or textbox to another with the handy trackball positioned perfectly for your thumb. And don't worry about waiting for pages to load. The G1 is equipped with 3.5G and Wi-Fi technology... seamlessly switching to always offer you the best connection.
Instant notification bar discretely alerts you of emails, text messages or IM sent your way. Whether you're getting mail from Gmail™, another POP or IMAP account or receiving IMs from any of the most popular services, you'll be alerted as soon as a new message comes in.
Make the G1 your G1 with instant access to Android Market™. The market is constantly updated with exciting new applications for your T-Mobile G1™. Download and install your favorite software, music or games and more. The fully customizable home screen lets you put all the tools and gadgets within your finger tips.
HTC innovation delivers the next generation in mobile technology with the Android™ powered G1.

Highlights
3.2-inch TFT-LCD flat touch-sensitive screen with HVGA (320 X 480 pixel) resolution. Full 5-row QWERTY keyboard. One-Touch Google Search™. Customizable Home screen with instant Email, text message and IM notifications. Instant access to mobile Internet services (Gmail™, YouTube™, Google Maps™, Google Talk™, Google Calendar™). High-speed 3.5G network connection. Wi-Fi technology with seamless transition to open networks. Android Market™ with access to variety of software and media downloads. (some fees may apply) 3.2 megapixel color camera with auto focus. microSD™ (SD 2.0 compatible) expansion slot for all your storage needs.IDRISH 911

Dear,

• 1. Side out the Keyboard / Open Left Hand side Notch to unlock Battery Panel.
  
• 2. Insert TMobile SIM Card and Battery.
  
• 3. Press MENU Button Constantly and Switch the Phone using Red Talk End / Power Button but do not Release the Menu Key.
• 4. This will put on the Phone in Safe Mode.
• 5. Press to Emergency Dial Button, Windows dial *#06# and this will show IMEI Number: note it down and also Recheck IMEI with Box.
  
• 6. Give IMEI to Unlock Code Provider www.unlock-tmobileg1.com and get the Unlock Code.
• 7. Now Return to main Screen and Press MENU Button this Will popup APN Button, Just Press it.
  
• 8. Go to APN Setting. There will be so many APN already Preset. Again Press MENU Button this will show NEW APN Popup Button again Press.
  
• 9. Remember to put Right MCC (Mobile Country Code), and MNC Mobile Network Code, G1 Matches SIM card Data of MCC / MNC with these Setting and then try to use that. Settings.
  All World MCC / MNC codes is available here:
  http://en.wikipedia.org/wiki/Mobile_network_code
• 10. Now Switch off the Phone and Wait for Unlock codes.
• 11. Insert the Non T-Mobile SIM Card which you intend to use it with G1 and switch G1 on. (Your SIM must have
  Data plan / GPRS Activated so G1 will able to contact google.com for Activation)
  
• 12. HTC G1 will ask for Unlock Codes. Type unlock code carefully, typing wrong code thrice may make Phone Hardware Locked.
• 13. Once Unlocked your GPRS / EDGE / 3G Data Service will be active as per APN Setting we did before.
• 14. Type Google User name / Password in Signing Window and this will Activate the Unlock G1 Device on your SIM Card.
• 15. Make other remaining Data Setting like MMS / Home Page / Port to Active other Data Service

Thanks

sir my mobile is htc dream and my imei number is 352779030269263

Buying a new one would be very expensive. Go Visit HTC Repair Center located in Dallas Tx if you are local. If you are outside Dallas you can Mail-in your Phone to them.
For more information on HTC G1 Repair visit www.drcellphone.com. They are the best Cell Phone Repair Service Center in the Nation.

the phone is the HTC Dream. as it was the company HTC Taiwan who manufacture the phone.. the phone is Branded as the T-Mobile G1 because the phone is Unique to the T-Mobile Carrier.

if there is No T-Mobile in Spain, im not sure if you will get it at all ? the 3G band used my the G1 is Unique to T-Mobiles 3G Network