A low‑voltage electric current travels through the copper wire of the telephone network to the phone.
That current powers the speaker and microphone, allowing you to hear and speak.
The home’s electrical supply is not required, so the phone keeps working when the lights go out.
Mobile phones need a battery or a charger, which stop working without electricity.
The telephone network sends a tiny electric current that powers the handset and makes it ring.
Because this power comes from outside the house, the phone works even during a blackout.
Today’s smartphones rely on batteries or plugs, so they stop when the power is out.
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