API - Application Programming Interface
APN - Access Point Name
BSS - Business Support Systems
HLR - Home Location Register
ICCID - Integrated Circuit Card Identifier (printed on teh SIM card)
IMEI - International Mobile Station Equipment Identity
IMSI - International Mobile Subscriber Identity
IP - Internet Protocol
MNO - Mobile Network Operator
MSISDN - Mobile Station International Subscriber Directory Number (telephone number)
OSS - Operational Support Systems
SIM - Subscriber Identity Model
SMS - Short Message Service
SSL - Secure Socket Layer
USSD - Unstructured Supplementary Service Data (short codes)
VPN - Virtual Private Network
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