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This question already has an answer here:

Since I upgraded my s7 edge to nougat I am seeing this icon with circle quater of which is white and the rest dim and a plus sign in center. There seems to be no info in notification panel enter image description here

marked as duplicate by Izzy Jun 16 '17 at 14:02

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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That indicates that Data Saver is turned On in Settings - Data Usage.

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