Its a documented bug https://bugs.launchpad.net/ubuntu/+source/modemmanager/+bug/521578
In addition to all the above, look for an app called Betavine Connection Manager. an opensource vodacom project.
It does the job of the safaricom mobile office with more features like setting limits and advanced logging
Get it here -> http://www.betavine.net/bvportal/resources/datacards/os/ubuntu
It also comes with utils and drivers that sort out other HEADACHE MODEMS (some ZTEs and other Huwaweis)
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