The JETech cases on Amazon are really nice and super cheap. Not sure about a technical rating protection but mine has protected my phone from a few drops with no problem. I have the mate black translucent MagSafe one and I love it. Still feels like the phone is thin and premium and stop basically and fingerprints too.

What are you guys even talking about with all these trust/relationship issues comments? OP is literally asking on behalf of his girlfriend so that they can better understand why she had to change her passcode. Simple as that. And yes, it is most likely a profile installed by her employer’s IT department that forces a passcode change every x unit of time.