Hi @Sophieemarie
Thank you for your post and welcome to our community.
I am sorry to hear about the issues you are having with your phone.
Have you turned the phone off and on? I know that sounds simple but it does usually solve most problems 🙂
If this doesn't work, If you are able, could you try the SIM in another phone?
Could you also confirm if its multiple numbers you cant call please? Or is this just one particular number?
Are you able to text/use data?
Please pop me a reply when you can.