Old school Nokia, some of the best mobiles. Good software stability, only let down by the switching off issue after a few years, probably due to poor connection on the film circuit strip.
I still use one -- and it has, finally started to switch itself off ( so far only when in my pocket) --- so it mightbe time for it to go. Trouble is -- what to replace it with? All I want is a phone and bluetooth ( and predictive text) ..... not interested in cameras or mobile command centres 
The old bag has a Nokia 6230i (so do I somewhere, but never use it), and that seems to be fairly reliable. We the carkit (ck-7w) it seems more reliable bluetooth than cradled, seems nokia still haven't got over the connection problem at the base of the phone.
I certainly steer clear of Symbian based Nokias, too unstable (and thats from someone who uses a Windows based phone!), and fiddly to use.
Mine used to have connection probs now and then......i found my prob was dirt and dust getting into the cradle......try giveing the cradle contacts a light clean.......used to sort my probs for a few months
