My aunt offered my grandmother a used iPhone 4 a week ago. Today, my grandmother visited me, and I've shown her how to do various things on the phone. Until then, she found out how to use the alarm, how to take photos and how to call and text - everything went fine. I wanted to show her how to make FaceTime calls, so I connected the phone to my wifi. This is where it all began. The apple logo appeared, the phone shut itself down and since then we haven't been able to use the phone anymore. I tried resetting it by holding the power and the home button, the Apple logo appeared, disappeared, reappeared, disappeared again... but we never arrived to the home screen. Once there was even some kind of log text/debug text next to the Apple logo (the whole screen was full of it), sometimes the Apple logo would appear twice. I watched a video on YouTube, a guy managed to get out of this situation by holding the + button. It seemed to work in his video. I tried this but a weird vertical bar appeared and nothing happened. So it didn't work for us. Now the screen is turned on (there is "light") but there is nothing on it, it's just "black" basically (but turned on) and I can't shut the phone down or anything. It's a catastrophe. It appears to have been a jailbroken phone. My grandparents mock the iPhone and already call it pure trash. What can I do to make it work again? I don't have access to any computer. Is there a way to fix the phone without using a computer? Can I "remove" the jailbreak too in case I get to the home screen someday? I would like the phone to be reset to factory settings. Ok wow, as I type, the screen turned itself off. The battery is dead. I am recharging the phone now, perhaps something will change. Thanks very very much! EDIT: The dead battery saved me! I am back in the home menu after hours and hours. But the vertical bar is still there. How do I get rid of it? There's so many thing wrong with this phone. I want to get rid of the jailbreak too (in case there's really one...) EDIT 2: If I put the phone in horizontal view, the bar will move with the screen. So I suppose it's a software and not a hardware problem.