Cara Mengirim SMS dalam Flutter

// if you couldn't work with flutter_sms, add telephony package in pubspec.yaml
final Telephony telephony = Telephony.instance;

// this method does not need any permission
telephony.sendSmsByDefaultApp(
    to: 'target phone number',
    message: 'message'
);

// worked for me.
FunnyPointerException :|)