@tcpip : head to xda developers forum.
there are detailed instructions about how to root your phone.
there is difference in unlocking (which means you can operate other than T-Mobile sim) and Rooting (which means you can install your choice o android roms)
if you feel confusing buzz me with the link of thread you are following.
RC27 of original T-mobile ROM allowed rooting, later ROMs dont allow so you have to downgrade first to RC27.
and yes to use your G1 you need to have active google account, and gprs if you dont have gprs you can start with wifi too just browse few pages back on this page i have posted about how to start with wifi.
Without wifi / gprs you can not proceed further
there are detailed instructions about how to root your phone.
there is difference in unlocking (which means you can operate other than T-Mobile sim) and Rooting (which means you can install your choice o android roms)
if you feel confusing buzz me with the link of thread you are following.
RC27 of original T-mobile ROM allowed rooting, later ROMs dont allow so you have to downgrade first to RC27.
and yes to use your G1 you need to have active google account, and gprs if you dont have gprs you can start with wifi too just browse few pages back on this page i have posted about how to start with wifi.
Without wifi / gprs you can not proceed further