iPhone 6s Problem

[iMore Question]

How do I get rid of a call back number that keeps popping up on my iPhone 6s even after I have called the number back. I have tried several things to no avail.

 

[Just_Me_D]

What specifically have you tried? As for a "call back number that keeps popping up", I've never experienced that on any mobile phone I've ever owned. Anyway, where on the phone is the call back number popping up?