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For a real safe delete of all data on the device, a simple factory-reset won't do: data might still be recoverable if one takes the efforts required for such a data-recovery. …

Tap "Delete Cache", then "Clear Data". This will remove all cache files the app might have created, all its data, and its configuration. Still "grayed out?" …

There are several apps claiming to help you out with this, see my Secure Wipe app list. They support different sub-sets of actions (e.g. only wiping free space versus "secure deleting files", or only …

If you see a button labeled "uninstall updates", that's a system app which you cannot remove without root powers. User-installed apps never have that "uninstall updates" button, for a simple technical …

Assuming you are talking about apps you've installed yourself (and not about pre-installed apps), you can utilise adb for this. You need to know the app's package name first (the part shown in the Pla …

These tools do not simply delete your data or wipe the storage once, but they overwrite it multiple times, then wiping it, and then finalize their work by a factory-reset. …

There's no such thing built-in to Android currently. However, you might wish to take a look at AutoErase: When the number of failed unlock attempts reaches the limit that you specified, AutoEra …

As root is not available, there might be another viable approach by just clearing the app data. For some background, please take a look at our adb and adb tag-wiki. The idea, in short, is walking all …

This very much depends on the device and the Android version running on it, plus where you've bought it – as the lot of pre-installed apps might differ based on that. I'm not sure about Gmail – but th …

If you can boot your device in bootloader mode, you can use fastboot for this task (see our fastboot tag-wiki for details): fastboot -w # erase userdata and cache (and format if supported …