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When you are asking how to reset an iPhone, all you need to do is determine what kind of reset you require. Minor problems can be resolved by giving a mere restart that does not remove any data. To delete all data and reset to defaults, one must go to the settings, by tapping general, then transfer/reset iPhone and clicking the full reset option. You should always remember to save your pictures, messages, and other valuable files because when you do a complete reset, you will not lose anything significant.