On the NM website
https://live.gnome.org/NetworkManager/MobileBroadband
it says
Huawei E220 (firmware versions older than 11.117.09.04.00 (Vodafone
only) are known to be problematic; make sure you have 11.117.10.00.00 or
later)
Do you have the required firmware?
** Changed in: network-manager (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/779554
Title:
Connection unreliable -- Huawei E220
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