One oval circle split in two in notification bar

Have you ever seen this icon in the notification bar - an oval circle that is split in two halves? How do I remove this as it is not an option to de-activate or remove - only time it goes away is when i switch off the mobile data. I have a samsung galaxy s7 phone on android 7.0

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• Screenshot_20170926-221219.jpg (166.3 KB)

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