The Amish are not opposed to technology per se. They are opposed to technology that disrupts family and community life.
The Amish use disposable diapers, chemical fertilizers and pesticides and grow genetically modified crops. Phones, so long as they aren’t in the home, are OK.
They are also very decentralized, so how one group interprets that may be different from how others do. Some allow tractors. Some don’t. Heck, some allow only open buggies. Others allow covered buggies. They are increasingly allowing electricity in their barns and workshops, but many allow it only if it comes from off-grid sources.
Here’s a good piece on Amish hackers from several years ago.
http://kk.org/thetechnium/amish-hackers-a/
It really explains how they decide what technology to use or not use.