I keep a simm card for a mobile phone in my urban psk, that has 100 prepaid minutes on it. I know where I go (urban environments), I can always find an unlocked mobile.

Its not ment to be a guarantee phone call, but more of a nice feature.

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"One should not increase, beyond what is necessary, the number of entities required to explain anything"
William of Ockham (1285-1349)