Jack gets in contact with CTU the first time since his disappearance ...
... sending out some photos of the terrorists who plan on bombing Los Angeles International Airport
CTU isn't of much help, so Jack gets in contact with Chloe ...
... sending her a photo of the main evil dude who carriers detonators around his waist ...
The transmitted photo proves to be useful - Chloe can use it to figure out the trigger frequency for the detonators ...
... and a bit later she remotely reflashes Jack's Treo ...
... so Jack is ready to use his Treo for remotely triggering a small bomb, causing the little diversion he needs to subsequently save the world!