Is cell coverage / SIM card needed? Jane Jonson Updated January 13, 2017 15:40 Follow No, Findster Duo doesn’t require cell coverage or SIM card to work properly. Related articles In which countries can I use Findster Duo? What’s the difference between a Guardian and a Pet module? Can I use Findster Duo for other applications beyond tracking pets? 9. Using Findster Toolbox How many Pet modules can I connect to a single Guardian? Have more questions? Submit a Request Comments 0 comments Please sign in to leave a comment.