APN (Access Point Name) - The gateway between a mobile network and another computer network.
CDMA (Code Division Multiple Access) - A form of wireless communication, in which data is sent over multiple frequencies simultaneously, optimizing the use of available bandwidth. 800 MHz - 1.9 GHz.
Dynamic IP Address - A type of IP address that is temporarily assigned by a service provider, and can change as frequently as every hour.
GSM (Global System for Mobile Communications) - A form of wireless communication, in which data is digitized and compressed, and sent down a channel with two other streams of user data, each in its own time slot. 900 MHz or 1800 MHz.
TCP/IP (Transmission Control Protocol/Internet Protocol) - Is the basic communication protocol of the Internet.
IP Address - A unique identifier given to each IP network device.
LAN (Local-Area Network) - a computer network that interconnects computers within a limited area.
MDN (Mobile Directory Number) - Ten-digit telephone number assigned to your modem, including the area code (also just referred to as phone number)
MIN/MSID (Mobile Identification Number/Mobile Station ID) - A number given by a wireless operator, to identify a mobile user.
RF - Radio Frequency.
RSSI (Received Signal Strength indicator) - is the measurement of RF signal strength between the remote modem and a base station.
SIM (Subscriber Identity Module) - Stores data for GSM modems and phones, such as user identity, location, phone number, network, etc.
SMA (SubMiniature version A) - A coaxial Radio Frequency connector.
SMS (Short Message Service) - A communication protocol allowing short text messages sent between mobile telephone devices.
SMTP (Simple Mail Transfer Protocol) - The standard protocol for e-mail transmissions across the Internet.
Static IP Address - A type of IP Address that does not change over time.
WAN (Wide Area Network) - A geographically dispersed telecommunications network.
Some definitions were sourced through Wikipedia.