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.
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