Installation Manual

PART 2 – Cellular SocketModems Chapter 2 – SocketModem Cell & SocketModem iCell GPRS
Multi-Tech Systems, Inc. Universal Socket Hardware Guide for Developers (S000342M) 66
Changing the Quad Band
If for any reason, such as moving the modem from one geographical area to another, you want to change the band,
you can accomplish this by using the +WMBS AT Command.
Steps for Changing the GSM Band
Use a terminal application such as HyperTerminal for entering the AT Command.
1. To open HyperTerminal, click Start. Then select Programs > Accessories > Communications. Then
click HyperTerminal.
2. When the command window opens, type AT+WMBS=<Band><Param>. Press Enter.
• For <Band>, enter the option you desire:
4 = Dual-band mode 850/1900MHz
5 = Dual-band mode 900/1800MHz
• For <Param>, enter the option you desire:
0 = Modem must be reset in order to use the specified band(s). This is the default.
1 = Modem restarts immediately using the specified band(s).
Example: AT+WMBS=4,0. Press Enter.