Well the T-Mobile G1 has recently been released into the wild and it’s only a matter of time before one gets hacked to be unlocked. How about right now?
[Note: This will unlock the phone in all ways but making actual phone calls, who needs to talk to people anyway when your IM apps will work?!]
This honestly has to be the simplest hack I’ve seen for unlocking a phone. Currently your ’supposed’ to wait until a two-year contract is up or wait for 90 days so that T-Mobile will unlock your phone for you. Impatient? We sure as hell are! This ‘fix’ also lends itself to the lazy personalities that run this site.
1) Insert friends activated T-mobile SIM into G1 along with battery
2) Power on and wait for setup screen
3) Go through setup process to link any Gmail account
4) Go to Settings > Wireless Controls > Wi-Fi Settings > Enable Wi-Fi
5) Connect to nearby Wi-Fi network if one is available
6) Optional: Stop the phone from syncing with Gmail account by going to Data Synchronization and unchecking Auto-sync, Gmail, Calendar, and Contacts
7) Once done, take out friends SIM card and insert unactivated SIM that came with G1
Pretty much fi you want to unlock the G1 all you need to do is borrow someone’s active T-Mobile SIM card and insert it while the G1 is going through it’s setup process. This will enable the free Wi-Fi and obviously while you won’t be able to call someone without a valid T-Mobile SIM card in the phone you will have full access to use all of it’s other features (see: play around online.)
Found here :
http://shinyswine.com/t-mobile-g1-wi-fi-unlock-hack/