How many DPI does the T-Mobile G1 phone have? I've got a G1 borrowed from a friend and I was wondering what is the DPI/PPI for this phone.

I tried to Google for that, but no luck so far.
Thanks!
According to the specs at Wikipedia it is


320 x 480 px
3.2 in (81 mm)
HVGA 65,536 color LCD
180 pixels per inch (ppi)