Does anyone know what app these notifications are from? It is not from the default messaging app.

[swdk66]

https://imgur.com/gallery/8iTx8sT

 

[B. Diddy]

Welcome to Android Central! It looks like voicemail. Which phone and which carrier are you on?

 

[swdk66]

Hi it's Public mobile in Canada and tcl alcatel phone

 

[B. Diddy]

It is a bit odd that it tells you to open your SMS app. Which messaging app are you using? Try going to Settings>Apps, select the messaging app, clear its cache, then Force Stop it. Does the notification go away?