You know that thin metal foil that they like to use for wrapping chewing gum?
You know how it often times crumbles and sits in the bottom of your pocket after washing them?
Well sometimes, it can also get into the headphone jack on your iPhone and begin wreaking havoc.
To make matters worse, at the end of the inside of the headphone jack (where the tip of the mini plug goes) there is a small hole that exposes the thin film cable that connects said headphone jack and noise canceling mic to the mainboard of your phone!
So, after the gum wrapper pieces got inside my phone, I got to trying to dig them out, and damaged said cabling.
Prepare a clean working area, and print (or draw) a chart where you can place the screws removed form your iPhone as you remove them.
There are many screws that are only slightly different (in fractions of millimeter diameter or length) and you will want to have a visual reference of what parts and screws go where when you go to reassemble your device!
Go slowly, making sure to follow the instructions carefully.
When you get to the point that you are removing the thin film cables from the inside of your phone, proceed very slowly making sure not to pull up to fast or tear the cabling.
After about an hour or two of work, you should be all done!
Now my phone works perfectly, and to be extra careful, I put a small piece of hard plastic shielding on the back of the headphone connector to prevent outside debris or protrusions from damaging the fragile internal cabling.
If something happens to your headphone connector, DO NOT go digging in there to get something out!