Do you have a contact in your iPhone that is blocked from calling you and you're not sure why? You might have to change a setting or share your contacts to fix it. Please make sure that you are on the most recent update of the Hiya app.
In the Hiya app, tap on Options in the bottom right, then scroll down to the Spoofed Calls / Neighbor Scam option and choose Alert or Do Nothing. The block option for spoofed calls will block all calls with your area code and your prefix. Those in your contact list will be fine if you are sharing your contacts with Hiya.