Can I fix this thrown away iphone?

So I found this iphone 4 or 4s i'm not sure on the side of the road all smashed and stuff, the led light still turns on and it still connects to the computer everything seems to work fine, if I paid for a new screen I could use this phone, but it has a passcode on it when i plug it into my computer, is there a way to get rid of this passcode and use the phone or should i throw it out? It is a perfectly good phone if it were fixed but I don't want to pay good money and not be able to use it, help.

Is it dangerous to unplug iPhone 5 battery while it's on and charging?

Is it dangerous to unplug an iPhone 5 battery while it's on and charging?

I want to run the iPhone without the battery and I heard that it would not boot up if the battery isn't present. So I was wondering if it was safe to unplug the battery while the phone is still on and plugged in.

How long does your iphone 5c battery last?

I have had my 5c for three months and within the past month I have noticed the battery life is way shorter than before. My phone will die after 11 hours of standby and less than one hour of actual use that consists of texting and maybe a bit of candy crush. Both apple and Verizon employees have told me this seems normal, so I was just wondering what other users experiences are like. Does your 5c battery life suck too?

(And yes I have tried every suggestion under the sun to extend the battery life.)

Added (1). I mean that it dies after 11 hours of standby and 1 hour of use, so 12 hours total after a full charge.

What is the best way to get in the most calories to gain weight?

I've been trying to gain weight by eating more and building muscle for the past month and I'm finding it really difficult to eat all the calories that I'm supposed to eat. Been using MyFitnessPal for iPhone and according to it I'm to take in 2, 410/day. I have been meeting that goal for the past few days but sometimes, I feel so full throughout the day I can't take another bite!

Are there any ways I can take in lots of calories without feeling so full?

If you'd like you can add me on MyFitnessPal to see my food diary: apgarcia88

Any helpful information is appreciated!

Why does my iphone not receive group messages unless 4g is on?

When I'm at home and I'm using Wi-Fi I always turn off cellular data because I don't want to accidentally be using up my data, but whenever it is off I never receive group messages until I turn it back on? Why does it so this and can I make it so I can still receive group messages when only using Wi-Fi?

Should I get a 16 gb IPhone 5s or a 64gb iPhone 5?

They cost the same off of at&t.com so i'm faced with the choice of choosing of the 2. I currently have an ipad which is 32gb and i only have 3gb less so i'm not sure if 16gb iphone 5s would be enough. Which one should i get? Is the iphone 5s really that much better than the 5?

My eyes hurt, especially whe looking at a screen, why?

So recently my eyes started hurting, especially in the back when I look at my iphone screen or a screen in general, I haven't been having lots of screen time but I would watch about an hour to two hours of netflix on my phone when I go to bed, and my eyes are a bit more sensitive to light, are they just irritated or is there some bigger problem?