How can I check if my phone supports GLONASS, WAAS and EGNOS?
If you can see the NMEA data , may be from Android APP (available in plenty) , the Prefix would say what GNSS system , its supporting . Like GP Prefix stands for GPS. GLONASS should be GL and Galelio would be GA. But there are some NMEA Sentences which combine  more than one GNSS System and use a different prefix. Better to understand NMEA Format . 

$GPRMC,162254.00,A,3723.02837,N,12159.39853,W,0.820,188.36,110706,,,A*74
$GPVTG,188.36,T,,M,0.820,N,1.519,K,A*3F
$GPGGA,162254.00,3723.02837,N,12159.39853,W,1,03,2.36,525.6,M,-25.6,M,,*65
$GPGSA,A,2,25,01,22,,,,,,,,,,2.56,2.36,1.00*02