Pretty good but...
… there’s a preference you can set for a default area code (mine is 520) on phone numbers. This app wants to set ALL area codes to the default, not just numbers without area codes.
So 234-4567 gets revised to (520) 234-4567 as expected but (814) 654-5432 gets revised to (520) 654-5432. I consider this a fatal bug.
Attempts to contact customer support were returned as undeliverable.
Denny
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Contacts Cleaner, v1.7.3