Can you fry an egg with a cell phone?

No. This was attempted by a viewer who guest starred on the UK TV show "Brainiac" aired on Sky1.

The guest viewer asked Brainiac the very same question and was invited on the show to test this. Two cell phones were tried, they were phoned but had no result. Then eventually with roughly a dozen cell phones, all phoned at the same time and still with no result.

So no, it isn't possible to cook and egg with cell phones. Try boiling some water.