Is It Bad to Hard Reset Your iPhone?
A Reset, as Apple Calls It (Hard Restart as You Call It), Will Not Harm Your iPhone at All. It's the Equivalent of Rebooting Your Computer. It Does Reset Your...
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Regarding this, what does a hard reset do to your iPhone?
A hard reset will restore the iPhone's setting to its initial configuration by clearing all the third party applications, data, user settings, saved passwords and user accounts. The process would delete all stored data on the iPhone.
Likewise, what happens when a hard reset doesn't work on iPhone? Press and hold both the Sleep/Wake and Volume Down buttons for at least ten seconds, until you see the Apple logo. Sounds like you were in DFU mode. If you hold on to home and power then just hold home, it goes past the hard reset and into dev mode.
Just so, does hard reset delete everything iPhone?
If you mean a full restore, then resetting your iPhone via Hard Reset will erase all your data completely. All your iPhone settings and your private data will be erased and restored to the original state. If someone tells you that a hard reset hasn't erase his data, it may be he just misleads restart/reboot as reset.
Is it good to factory reset your iPhone?
No. factory rest can speed up your device,and it help to clear app caches & app data. therefore you can get more storage to your device.