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pantech: implement capabilities switching in the Pantech UMW190

Submitted by Aleksander Morgado

Assigned to ModemManager bug user

Link to original bug (#85038)

Description

Originally reported at: https://bugzilla.gnome.org/show_bug.cgi?id=701916 Please refer to the original bug report if more details are needed.

The Pantech UMW190 is the only device we know of that supports different capability combinations (e.g. gsm/umts and cdma/evdo), and we can switch them using QCDM. The Pantech plugin could be subclassing load_supported_capabilities() and set_current_capabilities(), so that the QCDM-based switching is enabled.

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