I have finally got one for my Samsung S6 phone. It really does help in sunlight, though it does make the colours a little less strong
In the shade:
In direct sunlight:
It is running Oziexplorer with the French ICAO (I believe IGN) chart.
FWIW, the S6 has a great internal GPS. Works really well, starts up (gets a fix) even if the phone is powered up during flight, and seems very accurate. Ozi will use an external (standard NMEA) bluetooth GPS and I have that working on my 8.4" android tablet but didn’t bother with it on the phone; also my BT GPS can support only one client.