It seems this app is not a so called Diga, so most likely no trials needed/done. Still I guess the sensor does not work without app and just saying they dont support all phones is a bit lame in my eyes and their homepage says this, your issue is def not just a minor glitch
The list of proven compatible devices is mainly showing Apple, Samsung and Google Pixel…what do they think people do when they already own a phone when they are diagnosed with diabetes?