I play enough with cell phones. Currently I'm investing in equipment to do more than open an iPhone to replace battery or set Touch + Screen.
Had it in my hands not long ago a cell phone Samsung Galaxy Ace model GT-S5830C. I played a lot with him flashing ROMs and I taught my teenage son to do the basics and the phone ended up with him.
One day he came to tell me that there was flashed a wrong in the device ROM