Theseus
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An awkward triple negative - 'not' 'not' 'without' - meaning 'I have to have my mobile with me'.
A more sophisticated version also occurs in some versions of of Anselm's Ontological Argument for the existence of God i.e. if God is defined as 'that than which no greater can be thought of' and He doesn't exist, then by definition something 'greater can be thought of' than a non-existent God viz. a God which does exist, then God cannot not exist.:cheek::)
A more sophisticated version also occurs in some versions of of Anselm's Ontological Argument for the existence of God i.e. if God is defined as 'that than which no greater can be thought of' and He doesn't exist, then by definition something 'greater can be thought of' than a non-existent God viz. a God which does exist, then God cannot not exist.:cheek::)