Good Morning @JimmyTwoFaces, thanks for your post on our Community Forums, and a very warm welcome to you!
Sorry to hear that phone calls through to your sim card have not been working recently, how long has this been going on for?
Have you been having this issue when in one particular location, or multiple?
Can you possibly try the sim card in an alternative handset to rule out the prospect of the handset being the fault?
Kindest regards,
David_Bn