As a general broad rule among traditional Amish, owning or having x technology or modern convenience is approved of by the Church only if it's a necessity for earning an income. But, a ton of rule-breaking or rule-bending goes on.
Here are 3 do's and don'ts to get you started. If you'd like more do's and don'ts with detailed explanations, consider taking my Amish Culture 301 mini course. It includes video lectures, cheat sheets, and other resources.