Mobile phone card (3)

I believe the answer is:

sim

'mobile phone card' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for sim that I've seen before include "computer game" , "Information carrier" , "Card storing data" , "Role-playing game" , "Identifying card in a mobile phone" .)

I've seen this clue in The Irish Times and The Sun.

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