The Sierra Wireless 7700 is frequency locked to AT&T. I just found this the hard way! I had always been told that the GOBI were unlocked, maybe CARRIER wise they are, but GSM Band wise that seems untrue. They may be usable on other carriers by just changing the MEP code. If you would like to use your AirCard with a different service provider, you must obtain the AirCard modem’s MEP code from the service provider. Let me know how that goes....
MC7700 uses 700(B17)/1700/2100(B4) MHz GSM band - AT&T
MC7710 uses 900(B8)/1800(B3)/2100 (B1)/2600(B7)/DD800(B20) GSM MHz band - T-Mobile
MC7750 uses 777–787 MHz (B13) LTE, 746 - 756 MHz, (B13 LTE),1850–1910 MHz., 1930–1990 MHz PCS Verizon
Plus to use it with Linux, it must be a DIP unit, not a QMI unit.
The card operates either in QMI or DIP (Direct IP) mode - To identify what mode your card is in check the ProductID. Mine is a QMI, of course, as I would also like to use it with Linux. Though QMI is said to be much faster, it is limited to Windows.
0x68A2 = QMI (Windows 7 -10) as far as I know...
0x68a3 = DIP (Linux and Windows 7 - 10) as far as I know...
While I have read that there is a utility to switch the card from QMI to DIP, it is written for the Netgear 320U USB Device, which used the same chipset, hidden somewhere at:http://www.netgear.com/search-netgear.aspx?q=aircard
Use the search term" aircard 320u linux software" to find the software under your OS/Carrier to make this hack work. For more generic software like drivers and/or watcher you might just try "Aircard 320U."
I find it hard to believe that M300 programming board and two PC to perform this alchemy. Look here:http://www.szelins.com/download/usermanual/H685_MC7710_from_DIP_to_QMI.pdf
There maybe hardware differences that separate the 7700 vs 7710, so my T-Mobile Data plan, so far, is useless. I am in a Hospital bed right now running a fever, trying to make this work! So it all may be taken with a H U G E grain of salt. If EVERYBODY already knows all of this, I missed that meeting. LoL!
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