How to safely erase my iPhone 5S?
The iPhone 5S is still in good condition and runs pretty fast even with iOS 9.1. However, I planned to sell it out coz I bought an 6S this week to replace the old one. You know technology develops dramatically, i don't whether the deleted data would be recovered by others. So is there any reliable wiping tool available to permanently delete all the content and settings on my iPhone 5S.
Is this a good question?