my iphone will not charge. neither on pc connection or adapter

When you connect to the outlet or PC do you see any symbols/messages about charging?

If not, check the dock connector, both iPhone and cable to see they are clean and not clogged with lint or debris. Have you tried a soft reset by holding both the power and home buttons until the apple logo appears (ignore the red slider) and the iPhone restarts?

If none of the helps it would be worth a visit to an Apple store genius bar to have the techs take a look and run some tests.

If it charged to 100% then the system is working, or may be working slower than it should. When you say on the decrease now what do you mean? Is the charge level dropping fast? Or is it a slow decrease while still plugged in?

If the latter, that is normal, the charging circuit shuts down when the battery is charged so as to not overcharge. Then when the charge level drops to 93-95%, or so, should kick in again and top up the battery.

Not sure what a bluish coating would be but might be worth looking into with a genius bar tech if you can.

So I just had a problem with my iPhone 4 charging. When I plugged it in, it would make the charge jingle but the plug would show up in the battery like it was fully charged (I think it may also show up when charging with unsupported charger) instead of the charging spark (or lightning bolt thing) that usually shows up when charging. Lucky for me I had a spare iPhone battery lying around and swapped it out. This was after I tried turning my phone off multiple times and doing a hard reset, which didn't fix the problem. Anyway, the new battery fixed the problem, and now it charges just fine. Im not sure what was wrong with my old battery, it is a few years old, but it seemed to hold a charge just fine before it just stopped charging. If anyone else has this problem I would recommend trying a hard reset first and then if that doesn't work try swapping the battery before you go messing with the dock connector since it is a lot easier.

My iPhone 4 will not charge on any wall or vehicle charger, it will only charge on a computer. I just got this phone for Christmas and its not charging, I have cleaned, restarted and still nothing, I even called apple and they didn't help me any. What should I do? And what could possibly be wrong with it?

I had the exact same problem, Apple replaced my phone for me in December and that phone wont charge either. I advice that you take it to an Apple Store and explain your problem. If they cant fix it or see that there is something wrong they will give you a new phone for free.