Responsible use.
Interpret the number, not the person.
Respect privacy
Do not use a number string to claim someone’s identity, address, live location, account details or activity. None of those follows from a country code or range alone.
Label uncertainty
Say “original carrier” when a static mapping describes an original allocation. Leave current carrier and service status unknown without a verified current source.
Handle input carefully
Treat every submitted number as sensitive: document storage, retention and lawful data sources before interpreting user numbers.