The telephone company sends a small electric current along the copper wire directly to each phone.
That current powers the phone’s internal components, enabling ringing and voice transmission.
Because the power source is independent of the house’s electricity, the phone remains functional during blackouts.
In contrast, smartphones need internal batteries or external power, which run out when the grid fails.
This current is sufficient to operate the handset’s speaker and microphone, allowing calls during a power outage.
The home’s electrical supply is not required, which is why landlines keep working when the lights go out.
Modern mobile devices depend on battery power or external chargers, so they cannot function without electricity.
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