Calls made on low bandwidth may have difficulty connecting, and/or staying connected. Whenever possible us a Wi-Fi connection to place or receive Secured Calls.
If one or both parties to a Secured Call are on mobile carrier (no Wi-Fi), the strength of the connection to the mobile carrier (i.e. low bandwidth) can affect the call.
Using Secured Video Call requires more bandwidth. If you are not on Wi-Fi and have a low bandwidth connection to your mobile carrier, use only Secured Call (not video).