Not sure wether this is in manual (havent looked) but by holding down a
"letter" key whilst on the normal standby screen it takes you straight to
that letter in your address book, much quicker than the normal daft route
you have to take that goes through about 5 key presses. Found that one out
by accident  :).

As far as bluetooth things, if you havent tried Bluejacking thats worth a
laugh the next time your in a public place.  Do a search on google.....

Also if you like football management games, i just made one specifically for
T610, get demo at the link below.

hth

Keith
www.bramsoft.pwp.blueyonder.co.uk

Slightly amusing to turn on the bluetooth in public areas and see how many
other phones you find.  Try sending them something!

Not all other devices have bluetooth.  My PDA is IR only.  A laptop might
have IR only already built in.  Currently bluetooth seems to not be
perfected.  IR is almost flawless, but I see a lot of complaints about
bluetooth problems with various phones.

Make telephone calls?

Neither my laptop or my PDA have BT, so I use IR to communicate between
them.