Buying a letter string with existing currency is different from buying a blank one. You’re not paying for three characters, you’re paying for three characters that several industries already read correctly. ESN is the electronic serial number in telecoms, the identifier that follows a device through its life. It’s the Emergency Services Network in British public safety. It’s the European Student Network in higher education, and enterprise software used it for years to mean the internal social platform.

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.