Worked well copied 250 contacts in seconds. My nano to regular size adapter however was just a hair small. Had to put several layers of tissue around the top end in order to get it to not error, but that the fault of the adapter and not this copier. It will not interfere with the already on the sim card carrier information as it only copies contacts. I did have to unscrew the back as the plastic tab that disconnects the batteries was broke off and could only be removed by removing the back. Be careful of the four GPA76 battery orientation if you remove the back (two on each side).