Most Amish under 30 have secret cell phones. It would only be the oldest generations without them. There are even lots of wink & nod arrangements where they may even have electricity in some outbuilding but they unplug it when elder comes to visit. It also depends on the Order as some are more strict than others. They generally aren't allowed to have electricity in "the house" but batteries and other workarounds exist.

They aren't as isolated these days as they used to be. If you go to Costco, you see them with 3 carts loaded 3 feet high of all the same crap everyone else is buying. A lot of times, they don't even transport it back via buggy but call the "Amish taxi service" which is people who drive them around town in large passenger vans. Even from a work source perspective, a lot have moved on from farm work and work in construction, roofing and other trades. If you go to a gas station in the morning, you'll see work trucks roll up and only Amish rollout to go buy soda and lunches or whatever.

[Source: I live in Lancaster and have for many years.]

They don't really receive special accommodation for not using technology outside of being allowed to submit some required tax forms on paper instead of e-filing them, the logic being that the government requires them to do so under pain of punishment, so the government has to find a way to let them do it without violating their religious beliefs.

But there is not a general accommodation provided.

For sure, but I don't know how much of their luddite-ness (ludditude?) is simply a byproduct of their faith or vice versa :)