I'm having problems at times receiving calls from Google Voice on my iPhone 7 Plus. Service is with Verizon. Cell tower 1.5 miles away, getting 3 out of 5 bars for a signal. The problem is sporadic. My T-Mobile Android phone will ring even when the iPhone doesn't. Before I activated my T-Mobile To Go phone, the only way I knew that a call didn't ring on the iPhone was a text message and email saying I had a missed call or voice mail. Is this a known problem with either the iPhone, Google Voice, or Verizon?