I have a 6610i, like some of you others, except its case is silver.
Favourite features:
Definately my favourite is that I dropped it in the toilet and it still works!
well I thought it was buggered but after a couple of days I tried it again and was 100%! Some other good features are WAP/GPRS, MMS, Polyphonics and the camera is pretty good. I like having my own picture as the wallpaper. I took a picture of the cam pattern on my bag and it looks great! I also love having heaps of room for msgs and phonebook.
Gripes:
One of the main reasons I bought the phone was to have my own sound as the ringtone (IE sound recorder) but it doesn't have a recorder!! I wasn't happy at all. I'm wishing I had gone with the 3200. Oh well. Other than not having the greatest ringtones, I have nothing bad to say about this phone. I do miss having picture editor and ringtone composer though. I do realise both of these would be too complicated due to colour pics and poly tones, but just ones for monotone pics and tones would be nice...
Other phones (newest to oldest):
Nokia 3315: I still use this phone as well as I have 2 sim cards. I miss its picture editor and tone composer as above. It's still a very reliable phone which I love using, the worst thing though is that it doesn't hold the 200 or so messages that my new phone has.
Nokia 3310: Very nice phone for its time, but is surpassed by the 3315 in every way. I still use it if one of my other phones' batteries is flat.
Nokia 3310: My first phone was stolen, so my 2nd phone was the same because I liked it so much!