In which countries can I use Findster Duo? Jane Jonson Updated January 23, 2017 10:24 Follow Findster Duo does not require cell coverage or a SIM card to work, so it works in every country! This is also the reason why it doesn't require any monthly fees. Check out how Findster Duo works and read about out technology. Related articles Can Findster Duo be shipped to my country? Is cell coverage / SIM card needed? 10 most common issues and how to solve them Is Findster Duo safe for my pet? Does Findster Duo include a warranty? Have more questions? Submit a Request Comments 0 comments Please sign in to leave a comment.