I just bought a device to cut sims to fit the iPhone and iPad. I noticed when practicing on some old international sims that I have that the contact surfaces vary in size in location. When I cut some of them with the machine the contact area gets partially cut. Will this make the sim not functional. Also does anyone know of a tray that will work to convert the sim back to regular size? I tried the ones that came with the device but they will not fit back it the phone because the tray is too thick with the sim in it. thanks