If there was no cell service, the calls wouldn't have gone through and may not show up on your call log. There's also a lag in the call logs being updated. But ... to view them, log into your on-line MyVerizon account and click the blue Usage Details.
Yeah that's the point I want to make. That none of his calls will show up on my record, proving I never missed any calls from him. But thank you! I appreciate it.