One of the most frequent questions is whether a magnetic car mount would wipe a phone.
No, it will not for one simple reason. Internal components of a phone are made out of non-magnetic materials, therefore a magnet cannot disturb their work.
But what about the memory, you'd ask? Well, phones do not have HDDs (Hard disk drives) which use magnetic field to store information. On the contrary, phones hold storage chips, which are a type of flash memory, and which are not affected by magnets.
There are mentions on forums that iPods can be affected by a magnet. But that concerns only iPod Classic, which use Hard Disk Drives.Other mobile devices use flash memory and should not be worried about.