IPhone 4 iOS 7.1.2 This accessory may not be supported?

So for about two months, my iPhone 4 has been not charging AT ALL, unless its off but even then, it only charges to like 23%. I've tried so many different cables and bricks, and none work. What the heck do I do? I've tried factory reset, hard reset, and literally over 5 third party chargers and 2 Apple "supported" chargers. None work. I can't contact Apple about it because they charge ridiculous prices to contact them. What should I do? I can't afford a new phone.

There's no water damage at all, or dust/lint in the charging port. I'm positive its the software update.

Is there any way I can downgrade to iOS 7.1.0 or 7.1.1? I'm 99% sure it worked flawlessly before the update.

Why do my hands go numb while holding my iPhone?

My hands oftenly go numb (more of a pins and needles feeling) while holding my phone for a while. Is this due to the radiation from my phone? Also, it's not the way I hold my phone because it goes "numb" in any position.

How much would apple charge to fix my screen on my iPhone 5c?

Its out of warranty i and broke my screen on my iPhone 5c while skateboarding not only that it has some lines across it when the phone is on like pixels or something. Also half the the screen responds to the my touch other half doesn't work due to me falling on it, i would like to take to it to a shop where they fix these and other electronics but my trust is very little with those people and I'm afraid what if they don't do the job right and leave my phone all half-a**ed. So id like to know about how much apple would charge to get her like new again? Anyone out there done it? Please share and buying a new phone isn't optional they're expensive rather have my trusty 5C fixed

Why is this happening to my app?

Well my sister and I got the iPhone 6 and the people from the store said that they couldn't save our apps so that meant that I was gonna lose all my music because I had it all in one app but they did say they can save my pictures so I screen shot all of my songs and I was planning to download them all again on an app but all the music apps on the App Store suck I mean when you search for a song all of the apps show the same result and it's mostly covers or it has the song but not the full version so my sister told me about this app called idownloads plus and she could download songs on that app but when I would try it it wouldn't work so I don't know what to do now. Is there a reason why this is happening? Is there a way to fix this? Or is there any music apps where you can go to the browser and go to the music website to download the songs?

How to get internet on my laptop?

I bought a laptop offline from Walmart ( Acer Refurbished Granite Gray 11.6" C720-2848 Chromebook PC with Intel Celeron 2955U Processor, 2GB Memory, 16GB SSD and Chrome OS) thinking I was going to be able to hotspot it with my iPhone but I wasn't, so what do I get so I can get Internet access? And where do I get it from?

My iPhone 4 won't screenshot?

Whenever I try to screenshot something on another app like instagram my phone will make the picture sound like normal but then when I go to my pictures the picture isn't there. Why is my phone doing this? I'm starting to get really aggravated and i'm about to throw my phone out a freaking window