Why has ablack circle with a white cross appeared on my phone

[Android Central Question]

A black circle with a white cross has appeared on my phone how can I remove it please

 

[B. Diddy]

Welcome to Android Central! Which phone? That might mean Data Saver is on.

Show us a screenshot: http://forums.androidcentral.com/ge...ide-how-post-screenshots-android-central.html

Please register on this forum, which will allow you to engage in discussion more easily, as well as post images. https://forums.androidcentral.com/ask-question/409154-join-android-central-community.html