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Messaging app ver 16.01.153.0418 - Solves the GUI problem of screen going black
Installed new messaging app and all is well. Made changes to app in the Network settings to enable UPNP and SIP port 5060 and uncheck Use random ports, those settings did not save, that was an issue that I had read about before. I live in a LTE area and so phone has worked as expected, but there are patches where signal is poor to non-existent. Will get out this afternoon and see how the Linaphone app works.