Operation Manual

Abbreviations
SMS
Short Message Service
MMS
Multimedia Message Service
SIM
Subscriber Identity Module
GSM
Global System for Mobile Communication
PIN
Personal Identity Number
PUK
PIN Unblocking Key
IMEI
International Mobile Equipment Identity
USSD
Unstructured Supplementary Service Data
APN
Access Point Name
GPRS
General Packet Radio Service
UART
Universal Asynchronous Receiver/Transmitter