That's somewhat difficult to answer, because the Amish are very diverse, especially if you throw in their Anabaptist cousins the Mennonites. People generally believe these folks want to preserve a certain era, but it's more that they are wary of new technology because of its unknown effects on a community. Whether and how a new technology is acceptable according to the church is usually settled by a group of bishops. As you can imagine, this process has led to a lot of disagreement and schisms over the years, to the point that some communities will only have one community telephone in case of emergencies, some will allow phones on the edge of their property, and some just allow phones in the home. In short, yes, Amish communities have changed, but the degree to which they have changed varies from place to place.

Please no personal anecdotes people.