Singtel 's , outdoor coverage was above 99.6 % after 2015 .
Singtel Mobile was the first mobile phone operator in Singapore to launch the iPhone in 2008.As of second quarter of 2017 , Singtel 's 4G outdoor coverage was at 99.98 % , ranked first followed by M1 's 99.83 % , and Starhub 's 99.71 % .
Singtel