@Anonymous Thank you for reaching out to Microsoft Q&A, apologize for the inconvenience caused on this.
As mentioned in the Azure Documentation, the capabilities available (PSTN/SMS, Inbound/Outbound) depend on the country that you're operating within (your Azure billing address location) your use case, and the phone number type that you've selected. These capabilities vary by country due to regulatory requirements.
Also, SMS messages can be sent to and received from United States phone numbers. Phone numbers that are located in other geographies are not yet supported by Azure Communication Services SMS.
For more information, visit the Subscription eligibility documentation.
Please raise a feature request here, so that product team can check and prioritize this accordingly.
Feel free to reach back to me if you have any further questions on this.