iphone thinks headphones are plugged in even when not - how to fix

I've been trying to get this issue fixed on my iPhone 6 almost all day. I never use headphones and my phone has never had any water or physical damage. I tried SO MANY things and what finally worked for me was this.. HOLD DOWN THE VOLUME UP AND DOWN BUTTONS AT THE SAME TIME, WHILE STILL HOLDING THESE DO A HARD RESET. SO ALL THE STEPS YOU WILL DO AT THE SAME TIME ARE HOLD DOWN THE VOLUME UP AND DOWN BUTTONS WHILE HOLDING DOWN THE HOME BUTTON AS WELL AS THE BUTTON ON THE RIGHT SIDE OF YOUR PHONE. ONCE YOU SEE THE WHITE SCREEN WITH THE APPLE YOU CAN LET GO OF ALL BUTTONS. THIS SHOULD FIX THE ISSUE! I really hope this saves someone a lot of the hassle I've been through!!