Heres a fix that is SAFE and works. Use a cotton swab to rub alcohol or contact cleaner on the head phone cable jack and insert it a few times. Each time you pull it out, wipe the jack clean and insert it again. keep doing it until you see your ringer volume pop back up. Don't stuff a cotton swab up in there. I ended up using a toothpick with a tiny lens cleaner cloth wrapped around it and was able to insert it into the jack and rotate as I pulled it out. Lens cloth came out very dirty. Phone works now.