If you receive a screen on either the login page or when making an outbound call that says Could not Connect the Call:
This may be caused by a bug in your Convo app. Here are some basic troubleshooting steps you can try:
Swipe up and hold (if iPhone X or later) or double-click the home button (if older iPhone) and 'kill' your Convo app.
If you're still having trouble, try this:
Delete your Convo app.
Do a full restart of your phone.
Download the Convo app and try again.
If you get an Unable to contact the Server error message, try these steps.
This may be caused by your iPhone’s local network setting being turned off, possibly after recently updating iOS. Here's what you can try:
Open iOS settings.
Navigate to Settings > Convo.
Enable Local Network.
Restart your Convo app and log in.