the phone holder not so. clearly sat nav holders then thats a different matter, because its silly but alotof people still leave the sat navs in the glove box or under the passenger seat, ot in the boot,, one thing they look for is the circular marks from the suction cups on the windscreen, but some people wipe thes eoff but if you have a manky windscreen then you have a suspicious clean patch. i get round that i stick my sat nav between my dials, over the warning lights between the revcounter and the speedo. some times i need to run the antena some days not depends on sengas mood. (senga is my sat nav btw)