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A battery powered device which is prone to failure / running out of power

What exactly are you going to call them on if it does?

Borrow a phone, use a pay phone with reverse charging if required.

Another people's phones.

If I can get online I can get to my contacts. Its been a non issue for me for 20+ years. I'm not going to optimise for something that's not been an issue for 20 years.

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