Cordless phones take their power straight from the electricity mains and don’t always have battery back-up. This means they are unlikely to work in the event of a power cut, even if they are fully charged.
Mobile phones may work if they are charged, but it will depend on how widespread the power cut is and how long it lasts.
You may wish to keep a traditional, corded phone (which plugs straight into the phone socket) for a situation such as a power cut, to enable you to make essential calls.
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