Hot answers tagged iphone-4s
If it is still signed into your Apple ID and has Find My Phone enabled, erase it via iCloud: https://support.apple.com/kb/PH2701
That sounds like a sticky situation... You might be able to wipe the phone if your phone had Find My iPhone enabled in iCloud. You'll need to go to http://icloud.com and login, then select Find My iPhone and from there see if your iPhone is listed. Here you can lock the phone to prevent him using it, or Erase everything on it. If you didn't do this there ...
Alternatively there are apps that let you download texts off, such as PhoneView by ecamm but I heard they stopped working in one of the most recent updates, so I would check the demo first.
Yes, it is possible. The iPhone 4s can support the same versions of iOS as the iPhone 6 (see supported devices and Apple's iOS 8 information - see screenshot below from here) and both will run the forthcoming iOS 9, so it shouldn't be a problem restoring a backup from the latter onto the former. I've done something similar, restoring an iOS 8.x iPhone ...
the current os does not seem to show this data or at least not as described above. This is an excellent app which tracks battery health for both the laptop and iPhone. Free - http://www.coconut-flavour.com/coconutbattery/
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