phone chooses randomly when it will, or will not ring. I have gone through possibly 5 different phones with this same issue... multiple sims. multiple restarts. I use this phone to run a emergency service company and if it wont ring what good is this? From purely a business perspective i may have to switch providers for the well being of my company unless i hear some good reason why this keeps happening. All day my employee tried to call me but it just kept going to voicemail. Didn't ring or show me that he was calling. Anyone else with this issue?