GSM/GPRS General FAQ

Chapter 3 – Troubleshooting

The modem is answering, but seems not to be doing anything. What’s the problem?

•The modem is answering in voice mode.

•If you are trying to make a data call, make sure the account has CSD service. You will also need the data number (separate number from the main phone number given by the provider).

I am trying to make a data connection by dialing from my wireless modem to an analog modem. Why does the analog modem answer and send tones, but never connect?

•To make a data call you must use the ATD<number> command.

•Make sure the account has CSD service.

How do I get the voice portion to work so I can talk to others using the wireless modem?

•You will need a cable that has the speaker pins connected to a speaker and mic.

•MTS offers a “Y” cable that splits out to an RJ10 connector. The RJ10 connector plugs into the receiver of a handset.

How do I make a GPRS (Internet) connection using Windows?

•You must set the APN into the modem by using the command: AT+CGDCONT=1,”IP”,”<APN>” (APN is given by the provider). This must be done using a terminal program.

•Create a dial-up connection in Windows to dial the number ‘*99***1#’ using no username or password.

•You can also use Mobile PhoneTools which will set the APN automatically and create a dial connection.

How do I make an Internet connection to my dial-up ISP?

•Make sure you have CSD service.

•Create a dial-up connection to the ISP’s access number. Then, using your account username and password, choose the wireless modem as the device.

How does faxing work?

•You will need fax services set up on your account. You should receive a separate phone number for fax, just as you have done for voice and data. You must call the fax number for the modem to receive a fax.

•You will also need a fax software package (not provided by MTS).

Why do I get garbage when I am in HyperTerminal and I try to connect to the GPRS network by sending ‘ATD*99***1#’? I have already set the APN correctly.

•HyperTerminal will only return garbage in this situation. You will need to use a PPP application instead. The PPP application is needed to control the PPP session.

When I do ‘ATD*99***1#’ in HyperTerminal I get an error.

•Set AT+CMEE=1 and then try again to see what CME error is shown. Check the CME error in the AT Command Reference Guide.

•Make sure the APN is programmed correctly into the modem by sending ‘AT+CGDCONT?’.

•Check ‘AT+CGCLASS?’, If it returns anything other than “B”, change it to “B” by setting ‘AT+CGCLASS=”B”’.

•Make sure that you have GPRS (packet switched data) service.

I can’t make any outoing calls and I have a solid LS light. I’m receiving a NO CARRIER response.

•Make sure the antenna is connected and the SIM is inserted correctly.

•Check signal and registration: ‘AT+CSQ’ (10-31 is good), ‘AT+CREG?’ (0,1 is registered & 0,5 is roaming).

•Check NO CARRIER issue with ‘AT+CEER’. Look up error code in AT Command Reference Guide.

Multi-Tech Systems, Inc. MultiModem® GPRS with USB User Guide

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