"Amish" is not a unitary group. There are different "orders" or groups that local congregations affiliate with. And each individual church sets their own rules as to what is acceptable.
Amish will use modern tools and equipment if they're working for someone else. Some will use horses to pull equipment, but engines to run the equipment. For example, horses will pull a hay baler, but the baling mechanism may have an engine. And maybe it's a diesel engine because diesels don't use electricity.
Some will use pneumatic tools, if the compressed air comes from a windmill, not electricity or gas.
I've even seen some Amish (or maybe Mennonite) groups who will use modern tractors, but no cabs, and steel wheels, not rubber. Their take is that technology for work is fine, but not for comfort.
And as said above, they will use phones and cars of others for pay, but not own them.
I admire some of their ways and their devotion. But modern technology is not going to bypass them forever. It leads to some twisted logic and hypocrisy, as others have said.
And inbreeding may kill them before technology does.