fix(call-number): number should be a string
fix(call-number): number should be a string

closes #545
klirix/ionic-native,xueron/ionic-native,xueron/ionic-native,ramonornela/ionic-native,ramonornela/ionic-native,driftyco/ionic-native,xueron/ionic-native,ramonornela/ionic-native,driftyco/ionic-native,driftyco/ionic-native,xueron/ionic-native,ramonornela/ionic-native,klirix/ionic-native,klirix/ionic-native