PIN
Personal identification number
PSK
Preshared key
SDN
Service dialing number
SIM
Subscriber Identity Module
S/MIME
Secure Multipurpose Internet Mail Extensions
SMS
Short Message Service
SMSC
Short Message Service Center
SSID
Service set identifier
SSL
Secure Sockets Layer
TCP
Transmission Control Protocol
TLS
Transport Layer Security
Triple DES
Triple Data Encryption Standard
TTY
Teletype
UMA
Unlicensed Mobile Access
VPN
Virtual private network
WAN
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