My iPhone always shows unknown, any

Anytime anyone calls it always comes up with unknown, even with people i know that don't have there number blocked. The only time a number has ever come up within the past year is when i missed a call and got a text. I'm with optus so do i just have to call to change this or am i stuck with it? I've tried resetting my phone multiple time but still didn't work.

Call about it.

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