Vivo background app settings for Auto Message After Call

Vivo background app settings include a high background power usage list; allowing Auto Message After Call there stops Funtouch OS from closing it between calls.

Vivo phones run Funtouch OS or, in some regions, OriginOS, and both close background apps that use power unless the user approves them. The approval lives in a battery list that vivo has named differently over the years. For Funtouch OS 3.0 and later, the setting is described as Settings, Battery, High background power usage, where each app has a switch that lets it keep working even if it uses more power. Very old versions placed the same control in the iManager app under Power manager. Auto Message After Call does very little while it waits for a call, but Funtouch OS cannot know that in advance, so it needs to be on the allowed list. Vivo phones also have an autostart permission in some versions, and a lock option for recent apps. Turn on whichever of these your phone shows for this app, then make a test call while the screen is off.