Anybody else having trouble with international voice roaming? In both Mexico and now on a cruise with cell service the symptoms are the same. I get 4-5 bars and then any attempt to dial a number has the bars drop to zero. The bars also drop on their own and then reappear. Others on my trip with a different sprint phone report no issues. Yes the roaming is set to automatic, not sprint only. Data roaming is off. Anybody else see this?