Blaaah, I mistakenly bought a Huawei EM820W
that was falsely advertised as Huawei EM820U
. And to top it off, it was carrier locked to AT&T. Seller refunded me (less shipping) and told me to keep it, so I won't make a fuss. However..... I found a website that generates Huawei unlock codes this morning so I gave it a shot. It worked! In so doing I learned a few tricks on how WWAN modems work.
This tells you if the modem is locked. You need a SIM card installed for these modem commands to work although it doesn't need to be from the locked carrier. Of course, use a modem terminal app or "screen /dev/ttyUSB2" in Linux. You may also need to type ATE1 to echo what you're typing.
It will return CLCK:1 if locked or CLCK:0 if unlocked.
This lists the carriers and networks that the modem is locked to.
You get a list of one or more 5 to 6 digit Mobile Country Codes/Mobile Network Codes. This wiki helps you make sense of them: http://en.wikipedia.org/wiki/Mobile_country_code
. For example 310170 means 310 for United States and 170 for AT&T GSM 1900. Note that even if your modem is unlocked, it may still have been designed specifically with a mobile carrier in mind so the MCCMNC codes won't disappear after you unlock it.
Add the Huawei EM820W to the list of working WWAN modules for the CF-30 (and CF-19 of course)! I tried it out with my Koodo SIM and it worked. It did not work with Videotron which means this might not work with T-Mobile stateside.