I have for got password my phone htc t-mobile g1 are you can help me

SOURCE: HTC Dream "G1", locks on

The phone needs to be reprogrammed / reflashed with the original software.

you need to obtain a rom image of the phones program and then place it on a storage card that fits to the phone.

Then you need to start the phone in boot loader mode to flash the program.

you can also try the recovery mode and see if allows you to fix the issue. more information about programming the phone here http://wiki.xda-developers.com/phpwiki213/index.php?pagename=HTC_Dream_overview_and_useful_information

if you require a rom file for the phone you may be able to find one from http://forum.xda-developers.com/wiki/index.php?title=HTC_Dream

if you are unable to get the phone to function contact your dealer or take it to a repairer.
recovery mode Hold Home button and press power button In this mode you can open shell/flash image/perform backup etc. depending on which recovery image you have on the phone. Press CALL+MENU+POWER buttons simultaneously to exit mode.
bootloader mode Hold Camera button and press power button In this mode you can install new system image (DREAIMG.NBH) from SD card by just pressing power button again.