No , but yes . I did find that unless the unit is connected to WiFi the it will not sync with the phone . If away from WiFi you will need a sim . I fitted a 3 network pre loaded sim , data and now it will sync when away from WiFi .
The lack of instructions is annoying but I have found that the sim and and if doing routes on any other app I use Tom Tom mapping as i understand this is what the unit uses . Moving forward I have found it a great unit using pre made ( my route app ) routes sent via the app then to the nav . I ran a second nav at the same time to compare and the XT performed the same with no glitches from the new unit,
Early days yet but like the ease of use , stick with it as it works so well with the handle bar wheel and is system is fast .
As a stand alone sat nav it has great options , as a GPS unit ( pre made and complex routes ) I am still experimenting with twisty double back routes around wales to see how it works as it does not have “ do not recalculate “ off button .
Edited the will not sync with the nav to the correct phone , sorry.