answer:Yes, lots of things in the smart phone could be damaged, or have its data erased by a magnetic field. The screen could be broken, leaving pixels green or dead, info could be wiped, and much more damage could be done. However, you need not worry. The magnetic field will not be strong enough to cause any damage in my opinion. Unless you are using a large rare earth magnet or something, you wont hurt it. How close do you have to put the magnets before you can feel their pull? that will give you a rough idea of the size of the field. If the magnet snaps together hard when it is 1cm away from the other, all is well. If you can attract the other magnet 10cm away, then it will do damage.