Similar results would happen here in the San Francisco Bay Area after a major earthquake. I would expect no electricity, no landline or cell coverage, probably no natural gas and water.

With no electricity, most stores would remain closed, you wouldn't be able to charge anything, and you couldn't pump gas.

We have amateur radio and a couple of big batteries, so we could provide health and welfare traffic for our neighbors. Satellite phones would also continue to work as long as batteries lasted; unfortunately, having a full-time satellite phone account is more expense than I'm willing to pay, so ham radio will be our window to the world.

I understand Egyptian hams are operating in the low 40M band, if anyone is a SWL. If you're a ham and can relay health and welfare traffic, I'm sure it would be much appreciated by friends and family here in the states.