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Version 0.0.3
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* Better handle missing and disabled modems
* Better feedback when entering top up codes if
  m-b-p-i has length information for the ussd code.

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Version 0.0.2.1
===============
* Update to PyGObject 3.0

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Version 0.0.2
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* Use GDBus instead of dbus-glib
* Add icon
* Use main window with menu bar instead of dialog
* Don't fail when provider disappears from m-b-p-i