how do I get back to the call in progress when I went to another screen?

[Android Central Question]

I see the little phone flashing in the upper left hand corner but it does nothing.

 

[B. Diddy]

Welcome to Android Central! Which phone, and which version of Android is it running? If you don't see a floating call icon on the homescreen, then swipe down the notification panel and see if there is a notification for the ongoing call. Tapping that should reopen the Phone app.