20 Most Recent HTC AT&T Titan PI39100 Mint Cell Phone - Page 9 Questions & Answers

First switch on bluetooth (settings---bluetooth).
Start > Settings > Communications and Add new Bluetooth headset. htc will search bluetooth headsets and find it. it will ask you to enter bluetooth passcode, usually it is 0000. then finished and you have paired Bluetooth headset with HTC

Here you go! http://dl4.htc.com/web_materials/Manual/HTC_One_A9/NA/HTC_One_A9_US_User_Guide.pdf?_ga=1.38498275.178127690.1484142472 http://www.htc.com/us/support/htc-one-a9/

Sorry, Take it to your carrier they should be able to help

There is a switch inside your headphone jack. When you plug your headphone in it moves and breaks connection telling the phone that the headphones are plugged in. Try plugging and unplugging a headset to see if it frees this switch up. If not you may have a malfunctioning switch.

Also, turn off bluetooth if it is on...it might be hooked up to a bluetooth headset if you have one.