Does the Map My Customers app work outside the US? Natalie Marcotullio March 11, 2020 21:12 Updated Follow Yes. Map My Customers can be used outside the United States. Related articles How do I find records that I’ve previously saved? If I use my cell phone and call a contact from the Map My Customers app, will it auto log an entry (call activity) in MMC? Comments 0 comments Please sign in to leave a comment.