If you can’t send / receive SMS, it's probably because of a problem with your Service Centre Address settings. Don't worry though, it's easy to fix!
Your service center address should be +65 9684 5999
For an iPhone device:
1. Call the number *#5005*7672# to access the Service Center Address settings.
2. If the Service Center Address is not +65 9684 5999, call **5005*7672*+6596845999# to reset your settings. The message "Setting succeeded | Service Centre Address | No Address" will appear on screen when completed.
3. And you're done! You're ready to start sending and receiving those SMS's.
For an Android device:
1. Go to the SMS application > Menu > Settings.
2. Select "Message Centre". You should see +65 9684 5999.
3. If the Service Center Address is not +65 9684 5999, edit the number to +65 9684 5999 and tap OK.
4. And you're done! You're ready to start sending and receiving those SMS's.