Android cell phone on Verizon Wireless
RingCentral Office Standard Plan
For either the RC Phone app or the Ring Central app (I'm honestly not sure why there are 2 apps?), how can you force all incoming calls to come through the standard carrier voice network, and not utilize VOIP? VOIP can be inconsistent when driving on the road, and Verizon has a strong network for voice. So I would much rather use my carrier's standard voice network/carrier minutes for all incoming and outgoing calls, and totally skip the VOIP option all together.
In the RingCentral app, there is a setting for outbound calls "Use Only Carrier Minutes" which is great. But this only affects outbound calls, not inbound calls.
In RC Phone, when I click to turn off the "Data (VoIP) Calling" setting, incoming calls no longer ring my phone, and I just get a missed call notification.
In my testing, I was able to successfully receive multiple incoming calls via my carrier's standard voice network (I believe using the RingCentral app), though I tweaked some settings and now all incoming calls are coming through as VOIP. So I know it's possible :)