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BTS-Base Transceiver Station (AKA booster) BSC-Base Station Controller BSS-Base station Subsystem DFS-Digital Financial Station HLR-Home Location Register VLR-Visitor Location Register IMEI-International Mobile Equipment Identity SMSC-Short Message Service Centre STK-SIM Tool Kit OTP-One Time Password TAR-ToolKit Application Reference USIM-Universal Subscriber Identity Module OTT-Over The Top POP Post Office protocol PIN-Personal Identification Number QoS-Quality of Service SMS-Short Messaging Service SS7-Signalling System No. 7 STK-Sim Tool Kit USSD-Unstructured Supplementary Service Data USSD GW-USSD Gateway EIR-Equipment Identification Register MSISDN-Mobile Station International Subscriber Directory Number