Android only: We're fans of using Prey to find lost Androids (and laptops), but if you want a last-resort means of locking or wiping out your smart phone, Norton's free (for now) beta app offers those powers, along with some feel-good malware scanning.
There's not a rash of viruses or malware apps circulating around the Android ecosystem these days — even the supposed "wallpaper data collector" turned out to be not actually malicious. Still, it's not a bad idea to have a scanner handy for when and if you need it. Norton's real strength is the offering of a free, universally accessible tool for remotely wiping or locking down your phone's data and SIM card access.
After devising a passcode for locking and unwiping, Norton stashes them away, then watches for them to arrive via SMS. If you can't get your phone back and fear for the security of your Gmail or other data, SMS yourself with
lock yourpassword, or
wipe yourpassword and so forth, and you're good to go. If you somehow fire off that command accidentally, you can set up two buddies in Norton's settings to have unlock capabilities from their phone numbers.
Norton Mobile Security's direct competitor in this game is WaveSecure, recently purchased by McAfee, and offering a bit more functionality for $US19.95 per year. Norton's app comes with a 101-day subscription (at least it did today), but no pricing is evident on the forums from which the beta sprung. You can grab it through the Market or using the QR code at right.