Hello OlisaD,
Welcome to the community!
Sorry to hear you're having issues making and receiving calls while in the US. I understand you are able to receive SMS messages. Are you also able to send messages? If you are able to send messages, I don't think there would be an issue with your account as that usage would also be considered roaming.
Have you verified your device is compatible and supported for voice-over-LTE (voLTE)? The US mobile providers have shut-down their '3G' networks in 2022 (see here). Since they no longer operate a '3G' network all calls will need to transmit via voLTE. Calls will not be able to fall back to the '3G' network in the US. If your device is not supported for voLTE, that could be a reason you are not able to make or receive calls while in that Country.
Aside: If your device is not supported for voLTE, you should note that Fido/Rogers is likely to decommission their '3G' network in the near future (some estimates suggest 2025). After that network sunset, customers will need to have voLTE-compatible (and supported) devices in order to make and receive calls.
You should note these forums are community-driven and not intended as a venue for customer services. We do not have access to customers' accounts and would not be able to investigate your matter. If you wished to discuss your situation, you would have to contact customer service. In addition, they can also be contacted via Live Chat, Facebook, or Twitter. Those methods can be accessed via the contact page posted above.
Hope this helps 😀
Cheers
