Well, about the new bug, you could considet filing it upstream.
https://bugzilla.gnome.org/browse.cgi?product=NetworkManager
** Summary changed:
- Slow and unreliable detection and connection of USB 3G Modem -- Huawei E1750
+ Slow and unreliable detection and connection of USB 3G Modem -- Huawei
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https://bugs.launchpad.net/bugs/426138
Title:
Slow and unreliable detection and connection of USB 3G Modem -- Huawei
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