A few N-Gage fans have set up an IRC channel purely for the N-Gage. Based at irc.gamesurge.net, you want to log into the #n-gage channel. If you're on a PC, we'd recommend using Hydra IRC Client, or you could try connecting directly from your N-Gage using Wireless IRC.
Chat With Other N-Gage Users
This channel is great. I'm working on getting some PtG and Pk clans going, and this will allow for us to chat with our friends!