I LOVE the floating moveable window while a time is set while using the phone. You should take that same concept to the phone interface and have a floating active call button with a 'hang up', 'speaker input' button.
A window saying "On a Call" popup would also be helpful for those on an external mic amd earphones. The message could be shown to anyone unaware of the call when they are trying to interrupt the person with the ongoing call.
Thank you for your suggestion. You may try using Mini Pop up window in Phone app -> Menu -> settings -> Call display while using app -> Set it to Mini Pop up and Enable "Keep calls in pop-up". Mini pop up window can be moved around to any location on screen. Please note that, it only works if a call is received while using another app and is lost if you press home button.
