Coloured circles appear on my iphone 6 plus screen mostly when i pull down notification on iphone 6 plus
I recently noticed that some colored circles appear on iphone 6 plus screen when i pull down the notification bar. Please tell me what is happening to my phone! I just bought it a month ago :( Here a picture of what im talking about : https://postimg.org/image/vy5s8vgxz/
iPhone 6 Plus, iOS 10.2, https://postimg.org/image/vy5s8vgxz