I've been testing the Braveheart PinePhone for quite some time now, but still have one problem that won't go away: While I can receive a phone call, I can't place one. (It always returns: Call Failed). A number of times recently I've downloaded the latest image and given it a try, only to get the same result. I'm using T-Mobile, which is alleged to be a good carrier for the PnePhone. Is there a trick to placing a phone call?