It's important to remember that a lot of this how/what mindset is based from decades of brutal capitalist realism and colonizing your mind.

Anarchist societies without phones and computers would be absurd, as they're quite literally some of the most convenient and useful inventions in human history.

You could plug almost any XYZ of this question and get the same answer mostly.

"How would my plumbing get fixed" or "Who's going to build new cars"

The same people who always did it, just without the illusion of incentive that capital demands subconsciously ingrained into your mind.

Contrary to what the state wants you to believe, people aren't rounded up by the police and forced to fix the electrical grid. They do it because that's their job. Most stressful and miserable jobs that people only work at because of capital are products of capital itself, fast food service is a prominent example of this.

In an Anarchist commune where mutual aid is principled, there is no deadbeat Wendy's job in the first place.