T-mobile phone lock and new update

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 .

How to Update G1 Phone Firmware RC33

1. Download RC33 update from Google here.

2. Rename the download file from signed-PLAT-RC33-from-RC30.f06aa9b3.zip to update.zip, and place it at the root i.e the very top directory of your Micro SD card. (If you added the file to your microSD card by connecting the handset to your computer via USB [rather than using a dedicated microSD card reader], make sure to unmount it and disconnect the USB cable now.

3. Turn off your G1 Make sure it's completely powered off. Now again turn it on by holding the Home+End keys until you see T-Mobile G1 logo.

4. From the icon screen, open the keyboard and hit Alt+L.

5. Press Alt+S to begin the update. Remember, the update needs to be in the root of the Micro SD card and needs to be named update.zip.

6. Once it finishes, follow the onscreen instructions and press Home+Back to finish.

7. G1 Phone will reboot a few times to flash different parts of the firmware.

If all went well, you should now be running the latest update, RC33. Enjoy your new, shiny RC33 update, complete with Google Latitude!

To make sure all your hard work wasn't for nothing, hit Menu > Settings > About Phone > scroll to Build Number. You should see RC33 in there somewhere.

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.

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

I had the same problem.. G1 phones are not really designed to deal with this issue very easily.
The only way around it is if you either:

a) remove your SIM card and put it in another T-Mobile phone, you can enter the code that way
or
b) take it in to a T-Mobile store and they will put it in one of their phones for you to enter code

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

my mobile requier insert sim card.

you need to perform a hard reset which will essentially erase the phone to factory.

• Power off the G1
• Hold Home Key + End key for 20 seconds or till you see a triangle with an exclamation point and a picture of the G1
• Open the QWERTY keyboard and hit Alt+W

Well first of, there is your warranty, but if your phone breaks after expirations, there is both an T-Mobile G1 Repair Guide and a third party T-Mobile G1 Repair Service, so there is no need to worry.

there have been a few problems with the IM service on the G1 Phone, (which is understandable with it being a completely being a new OS platform and also new phone hardware) T-Mobile and Google have just released an OTA (Over the Air) Firmware update which will be automatically downloaded to your phone within the next week or so. you will get a message appear on your phone asking you to accept the Update. with this update there are upgrades to the IM features making it faster and more reliable, and in your case. making the AIM part of the software work correctly !