Fall-back technology | 旧可靠的技术

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My parents have a hurricane lamp at home and keep a chimney cleaned so that they can use one fire place in their house. The digital equivalent for me is this Ericsson T39 mobile which is now about a decade old.
Ericsson T39
A combination of great battery life, simplicity and high quality Swedish product design means that I have a small robust back-up mobile phone. What’s your fall-back tech?