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A cellular network facility that allows users to send and receive text messages of up to 160 alphanumeric characters on their handset.
NIST SP 800-101 Rev. 1
a mobile phone network facility that allows users to send and receive alphanumeric text messages of up to 160 characters on their cell phone or other handheld device
NISTIR 7250 under Short Message Service
NISTIR 7387 under Short Message Service