I can't call the one perosn in contacts but they can call me
I was trying to my dad and the call just went straight to voicemail. But my dad can call me, and I can call all other people in my contacts. And my dad wasn't even blocked me nor have I. I have even tried deleting my contact off my dad's phone permanently and tried redialing the number but still I can't call my dad.
Dads phone- Samsung S7
My phone- Iphone 6s
could you please tell me whats wrong