Names starting with a verb read as instructions, and instructions convert better than descriptions. That’s the structural advantage here before the subject is even considered. Wi-Fi calling is a feature hundreds of millions of people use without knowing its name. It routes voice over the local network when the cellular signal fails, and it’s why your phone works in a basement. Eight characters state it directly. The name suits a VoIP provider, a travel calling service, an MVNO, a business phone system, or a consumer international calling app.