PIN
personal identification number
SDN
service dialing number
S/MIME
Secure Multipurpose Internet Mail Extensions
SMS
Short Message Service
SSL
Secure Sockets Layer
SMSC
Short Message Service Center
TCP
Transmission Control Protocol
TLS
Transport Layer Security
Triple DES
Triple Data Encryption Standard
TTY
teletype
WAP
Wireless Application Protocol
WML
Wireless Markup Language
WTLS
Wireless Transport Layer Security
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