the guys from the Mobile Security Lab seem to have a lot of time recently a couple of days ago they released a short study on SSL on mobile phones: Tricks for Defeating SSL: effectiveness test on mobile phones.
Tomorrow (7th of October) Hack-in-the-Box 2009 takes place in Malaysia for some reason I always forget HITB. I can't remember ever reading a CFP or anything. They seem to have a few mobile security related talks. Here is the Agenda. Bugs and Kisses: Spying on BlackBerry Users for Fun by Sheran Gunasekera, Side Channel Analysis on Embedded Systems by Job De Haas.
On October 9th the CFP ends for:
26C3: Here Be Dragons (26th Chaos Communication Congress)
December 27th to 30th, 2009 in Berlin, Germany
They always like mobile phone related talks, so go and submit something interesting.