When you find an iphone is it best to activate it or sell it?

I found a brand new iphone and the woman did not have a password on or find my iPhone. I was going to return it but she called me obsessively and kept telling me if I don't return the phone it's stealing. I told her to relax and that I will meet with her after the weekend but she said you, I want my phone now". I got fed up with the rudeness and I removed her SIM card and now I plan to keep it as a spare phone or sell it. What do you think is best?

My Other data on iTunes is inordinately large?

I'm pretty sure this is an error, can anyone confirm my suspicions? I have a 64GB iPhone, and my "Other" folder is taking up 15 GB of space? But I'm adding up all the data that is taken up by all my other things (Photos, Music, Apps, etc) and I just don't see how so much data can be taken up by other. I routinely delete my texts so that I can avoid this. Has anyone had a similar problem, can someone help me fix this?

Added (1). (If it wasn't clear… I have an iPhone!) :-D

How to record good quality electric guitar

Hi. I have an electric guitar and amp, and i tried filming myself playing using an iPhone. Obviously without surprise, the sound quality is terrible. I see Youtubers play guitar and the quality sounds really good. I want to know how i can record a video of myself on my computer and connect my guitar to it. I know that i can just get a guitar cable to aux adapter, but i would then have to go back to the recorded video and pair up the recorded sound to the video perfectly. I want something that will record me with a camera, but also record the guitar during real time without using an external microphone. I also want to be able to play a backing track in the background while i play and for it to record it at the same time as well.

I'm trying to sell some stuff that is lying around in my room to make some cash, CL didn't work, and Ebay had charges what are my options?

The things that I'm trying to sell are ; Two Electric Guitars and an Amplifier for it, a ukulele, Beats Headphones, Portable Chargers, random junk like (Keychain, hot wheels, tech deck, silly strong, etc) Gaming Watch, two IPhone 4, Yu-Gi-Oh and Pokémon cards, and a few other small things. EVERYTHING IS IN MINT CONDITION AND WORKING, NO FLAWS.
Thanks FOR YOUR Help!

https://www.quora.com/unanswered/I-am-trying-to-sell-some-stuff-that-is-lying-around-my-room-to-make-some-cash-I-tried-CL-and-it-didnt-work-and-I-dont-want-to-do-eBay-because-of-the-charges-what-are-my-other-options-look-at-comment-for-full-info?share=f4ddee16&srid=5kriA

Help Iphone 5c not turning on?

My phone has been off for two days and I just bought a new charger and I have been charging it for 2hrs and it's still not turning on and I already tried the force restart on it a few times what else can i do?