Asking for my Dad, who is having trouble with his iPhone 6. I've never had an iPhone so have no idea myself.
Recently my Dad's iPhone has started to act weird and play up. Examples include: randomly dialing numbers whilst he's on a call, cutting out on calls, going into different screens when he's trying to do something, calling a different number when he's trying to call someone, random key presses appearing on the screen when he's not touching it.
At first I thought the touch screen might be out of sync but my sister suggested he's been hacked. Phone is only ever on wifi for updates and he doesn't use it for browsing, just calls and text, though his plan does have a small amount of data included.
Any idea what this might be? If he has been hacked, how do we know and how do we fix it?
UPDATE: Thank you everyone for reassuring me and pointing out that this is a known thing. Looks like I was kind of right that it was a screen sync thing. Dad has a iPhone 6+, not jailbroken etc so I am now 100% positive he's got ghost touches. We had already tried updating the software, but will try a few of the other suggestions like removing his case and maybe a factory reset. If it doesn't fix it, we'll look at getting a new phone. The phone is pretty old so might not be worth going the Apple replacement route (whether for free or the $249 program depending), but I guess it's up to him. He's a bit curmudgeonly and stuck in his ways and this has turned him off Apple hahahaha.
Could be Ghost Touches.