What does USIM stand for?

abbreviation to define

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Possible Meanings	Rank
U S Intermodal Maritime	*
Uniform Signed Interval Mutation	*
UMTS Subscriber Identity Mudule	*
User Subscriber Identity Module	*
Ufficio Stipendi Indennita e Missioni	*

Note: Acronym Finder has 5 verified definitions for USIM