APN MMS settings from GSM modem


    I am currently developing a desktop application to send SMS and MMS messages. I'm using a GSM modem (the Sierra Wireless FX30), and I can send and receive SMS messages reliably. However, I can't send or receive MMS messages. I suspect that there is an authentication or other login error for the MMSC, since I can connect to the cellular network and access data services. I also used the SIM card in an Android phone, and have verified that the phone can send and receive both SMS and MMS messages.

    I currently have the APN settings for the GSM modem as -

    GPRS APN: fast.t-mobile.com

    MMSC URL: http://mms.msg.eng.t-mobile.com/mms/wapenc


    Port: 8080


    I have left the username and password options blank, as per the instructions for APN settings on this T-Mobile support site. Should I fill these options in order to access the MMSC?

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