Hi sallyrob68,
Thanks for coming back to us on this one.
So just to confirm you re having the issue on 2 Virgin Mobile SIM cards and also on your landline too?
As the landline and Mobiles work off different networks, this is certainly a strange one.
You've mentioned it does allow some landline calls through, is this your landline or the mobiles?
On your Mobile devices, are you using WiFi calling or using the general mobile data network?
Pop back and keep us posted.
Thanks,