Author

Rehmath Ali Shaikh

Project Director, CallMama

Rehmath Ali Shaikh is the Project Director at CallMama, where he leads product and editorial for the company’s international calling, virtual phone number, and SMS services. He has spent years working across cloud telephony and the North American Numbering Plan, and writes practical, well-researched guides that help people understand area codes, country codes, and how to stay connected affordably across borders.

Every guide on this blog is written and reviewed with accuracy in mind — cross-checked against authoritative sources such as NANPA and the ITU — so readers can rely on the details before choosing a number or placing a call.

Areas of expertise

• Voice over IP (VoIP) and cloud telephony
• Virtual phone numbers and DID provisioning
• North American Numbering Plan (NANP) area codes
• International dialing, country codes and call routing
• SMS / messaging and number portability
• Telecom compliance, spam mitigation and STIR/SHAKEN