Evidence hierarchy
Primary official evidence
Regulator publications, numbering administrators, provider documentation, current terms and dated rate sheets.
Reproducible observation
Dated product-interface or support-flow observations with scope and account context recorded.
Qualified secondary evidence
Reputable analysis used for context, never to override a newer primary source.
Evaluation criteria
- Number countries and types, verified at number level
- Inbound and outbound voice context
- SMS/MMS eligibility and registration
- Emergency-calling setup and limitations
- Routing, hours and voicemail workflow
- Desktop and mobile administration
- Portability prerequisites
- Rate components and quote date
- Support path and documentation quality
- Privacy, security and compliance claims
Snapshot dates and change control
Every comparison should show when each source was checked. Dynamic inventory, capabilities and prices must be described as a snapshot, not a permanent fact. Material changes require a new review date and, where appropriate, an archived prior statement.
Limitations
A public comparison cannot reproduce every account, negotiated term, country, number, destination or workflow. Absence of a documented feature is not proof it does not exist. Availability should be confirmed directly for the intended use.
Corrections process
- Submit the challenged statement and source through the existing contact page.
- Provide a primary or reproducible dated reference.
- We compare source dates, scope and product context.
- Confirmed corrections update the statement, citation and review date.