How to get iCloud lock of an iPhone 5s (iOS 8)?

So I found an iPhone in the street a few days ago. I set it back to factory standards and everything's off it. When I turn it on it asks me to pick a language, my region, Wi-Fi, and then it asks me to sign into the apple account the device is on.

I've tried finding videos on it but all I get is ways to contact the previous owner. I've been in need of money and wanna sell it.

How can I get rid of the iCloud lock so I can sell it?

Transferring songs to PC: Iphone back up?

My laptop was stolen and therefore lost my iPhone backup, music, contacts, photos everything. I have exhausted what feels like every 'program' to try and transfer my data from my phone to my PC so I can then put back on iTunes. None of the programs I have tried, unless they are a trial (which only lets you transfer a limited amount of songs).

Please if someone knows an actual program that works, preferably free, that would be greatly apprciated! This is driving me nuts!

Average price for Iphone 5s per month?

I want to get an iphone 5s but I need to know what the average price for it including the plan would be per month. And which plan would be the cheapest for a single person without a family plan. Id prefer verizon wireless.

My iPhone keeps dying at 30-40%?

It this a battery malfunctioning? I sent in a diagnostic test to Apple online and they said my battery passed the test and it's working fine. Any fix? I already reset this with the power and home button but no use! Should I trade in for a new one?

Buying an iPhone 6 (outside of US) then use it in US?

So I'll move to Seattle, WA in the next several months. I live in Laos (Next to Thailand, if you wonder where it is).

I'm considering to buy an iPhone 6 Plus here, there's 2 models to choose ( Official unlocked US iPhone and official unlocked Thailand iPhone).

I wonder if I buy the US iPhone here and use it in US, will it work perfectly? I'm not sure if I buy the Thailand's and it will work perfectly there. Pros and cons?

Please explain me through all this, thanks!

How to disconnect an apple device from your account permanently?

So I gave my old iPod Touch (4th Gen) to my cousin, to have. I deleted my iCloud from the device, but recently, he was texting a friend of his, and their messages showed up in my iPhone's messages. Now EVERYTIME he uses it for FaceTime and messages it shows up on my phone.