Your own link says
The cell phone remains a controversial but increasingly accepted means of communication in some Amish communities.
Each community has their own rules- some permit cell phones and some do not. But even those that permit cell phones may not permit people to walk around with the phone on their person at all times - the Amish objection to phones was never based on the technology itself but rather its potential to disrupt their lifestyle. A phone shanty down at the end of the lane doesn’t lend itself to pre-teens or teenagers being on the phone all evening and not participating in family life.