It will affect your distance data via Phone GPS but the data recording gets logged into the frontier device. THe current problem I see with the Frontier X2 is that relying on GPS data for distance is very inaccurate, Hence, I use stryd to log my distance and then I combine the files to get an accurate display of my data.. *****Attention Fourth Frontier— Add the ability for users to add/Merge fit file so that data such as accurate distance can be displayed on the DashBoard****