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What does M2M mean?

Machine to Machine
M2M refers to data communications between machines. M2M is most commonly translated as Machine-to-Machine but has sometimes been translated as Man-to-Machine, Machine-to-Man, Machine-to-Mobile and Mobile-to-Machine. Among cellular telephone service providers, M2M means Mobile-to-Mobile, and is used to describe calls that do not involve land lines.
Machine to Machine

