Why am I getting the popup Conditional Call Forward Active when I try to make a call?

A

AC Question

Conditional Call Forward Active

Whenever i try to make a call on my samsung galaxy s5 a message appears saying "conditional call forward active" and then cuts the call off. I am not able to send texts either. It has been like this for 3 days now, i cannot think what could have caused it.

Does anyone have any suggestions of what could fix this?

Thank you!