How do i adjust the volume of the incoming call. It is set at a low volume and I would like the person calling to be louder.
The only way on the native ThunderBolt to set your in-call volume is during a call. You can call your voicemail and set it then. Afterward it should maintain that setting.
The TBolt has an issue where sometimes it forgets the in-call volume and the volume automatcially sets itself to max (or min). I have solved this with two programs from Google Play.
One: Volume Locker. https://play.google.com/store/search?q=volume+locker. This locks the in-call volume to a default that you set, but allows you to change it duing a call if you need to. Then it reverts back to the default after you hang up. It also locks other volumes on the phone if you like. I only use it for in-call volume becuase that's the only trouble I have with volume.
It's very simple. You do not have to download anything. When a call comes in , pick up the call and increase the volume of the phone by the volume button on the phone. It will permanently get set at that volume. You can change it only during the next call you recieve.