I'm trying to use my Bluetooth headset to make phone calls but it's not working, I have to use the mic and speaker, I know the problem is not my headset because I can listen to music using it. So far I've tried Whistle and some other apps. I've noticed that some apps would sound through my headset when started but as soon as I start dialing it switches to the mic and speaker. Is there a SIP/VOIP app that works with bluetooth. Thanks for any help.