I read somewhere that everything input to a cell phone is recorded somewhere on a memory chip or similar technology. I am wondering if there is anyway to completely erase any and all possible info that might be help in the phone, for instance if it is sold on ebay or collected from service provider traded in for an upgrade
There are also references to locking and unlocking security codes on cell phones. Can someone recommend a link to learn more about this topic?
This is similar to completely formatting or erasing a hard drive if you sold a computer.