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Multi-Tech Systems, Inc. MultiModem GPRS USB Wireless Modem User Guide 27
Chapter 3 – Using Your Wireless
Modem
Changing the GPRS Band
All MultiModem GPRS-F4 wireless modems support quad band (850/1900/900/1800 MHz). In reality,
they operate like dual, dual-band modems. In other words, they can be configured for 850/1900 or
900/1800 MHz. They do not automatically seek the local area frequency.
Band Options Overview
The GPRS-F4 wireless modems can be ordered with a default band of 850/1900 MHz or 900/1800 MHz.
850/1900 MHz – The wireless modem defaulting to 850/1900 MHz is identified with F4 in the product
ordering number. Example: MTCBA-G-F4. This build option is most commonly used in North American.
900/1800 MHz – The wireless modem defaulting to 900/1800 MHz is identified with F4-ED in the
product ordering number. Example: MTCBA-G-F4-ED. This build option is most commonly used in
Europe.
Changing the GPRS Band
If you want to change the band—because, for example, you are changing the geographical area in which
you use your modem—use the +WMBS AT Command.
To change the GPRS band:
1. To open HyperTerminal, click Start. Then select Programs > Accessories > Communications >
HyperTerminal.
2. When the command window opens, type AT+WMBS=<Band><Param>.
where <Band> can be:
4 = Dual-band mode 850/1900MHz
5 = Dual-band mode 900/1800MHz
where <Param> can be:
0 = The modem will have to be reset to start on the specified band(s). This is the default.
1 = The modem restarts immediately on the specified band(s).
3. Press Enter. For example:
AT+WMBS=4,0. Press Enter.
Determining the Phone Number for the Wireless Modem
Every wireless modem will have its own unique phone number. The wireless modem’s phone number
may simply be told to the subscriber or be on the SIM. Wireless provider implementations may vary.