Hi Matti,

 > test/online-modem
> =>
> - lots of traffic in ofono log
> - modem switches from blinking green to blinking blue
> - connmanctl monitor reports cellular interface (Powered=True + other
> status)
>

So modem goes online...

>
> activate-context
> =>
> Error activating /huawei_0/context1: org.ofono.Error.NotImplemented:
> Implementation not provided

There is no gprs context driver provided or it failed to setup.  Do you 
have TUN/TAP in the kernel or kernel module?

Please note, that there are two different versions of the Huawei cards 
supported by oFono.  One uses the "gobi" driver (these are Qualcomm 
chips).  While the more traditional one uses PPP & the "huawei" driver.

Regards,
-Denis