It looks like October can’t come soon enough for die-hard T-mobile fans hoping to get their hands on the Android-powered G1.  Thanks to some watchful eyes perusing the T-mobile knowledge base we are happy to bring you the full T-mobile G1 User Guide.  After browsing through the 48 page guide, there were a few key pieces of information we gathered and thought we’d pass on.

For starters the G1 is not limited to just GoogleTalk for instant messaging, instead you can select from 4 different messaging services: AIM / GoogleTalk / Windows Live Messenger / Yahoo! Messenger.  Secondly, the text messaging on the G1 is threaded-style so your conversations look like an IM window similar to the iPhone.  The final piece of information which caught our eyes is that the G1 can be used in mass storage USB mode, so the G1 can be your portable storage device to transport files (very similar to mass storage mode on Nokia devices).

You can download the entire PDF here