Freshly back from a new round of security based conferences I will take a moment to point out one of the more interesting topics for me this time around.
The discussion on Cell Phone Spying (not that I made it inside the actual talk with the ungodly line). More specifically how by using a frequency flooding technique on 2G networks its possible to do a MiTM type of ease drop on conversations & data. You can read more about it Here

As mentioned in the article a workaround for this issue would be to disable 2G mode on GSM phones.

Here is the quick and dirty way to do this in Android (tested on rooted phone)
DISCLAIMER: Forcing 3G mode will use more battery life
Also if your not on GSM don’t try this @ home…duh

Open Dialer and Enter: *#*#4636*#*#
After inputing the number you will be prompted with a “Testing” menu
Choose “Phone Information”
Scroll all the way down “Set preferred network type” and change this setting to WCDMA_only
That’s it!

I take no credit for the fix above as it was posted on the android dev forums.
Also this protects you from this exploit and any targeting 2G only, but many other GSM insecurities still exist. Another related topic also discussed was using a TOR client to obfuscate your traffic and make yourself much more anonymous. I will cover this topic a bit more in some upcoming Android based posts.