Possibly VoWi-Fi, Wi-Fi calling. It could be a carrier or phone specific feature. Without knowing more about your phone model and specific firmware details as per #1.2 and #1.8 of 40 Galaxy S5 models - Dummies Guide it is hard to say.
its wifi calling. voice and sms calls routing via wifi rather than the cell network. you prolly have a s5/s6 or iphone6, or latest nokia/ms. guessing you're on ee as well like me
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