Samsung Galaxy A3 (2016)
Android 5.1.1
Set up your phone for text messaging
A text message is a message that can be sent to other mobile phones. Your phone can send and receive text messages as soon as you've inserted your SIM. If this isn't the case, you can set up your phone for text messaging manually.
1. 1. Find "Message centre"
Press Messages.
Press MORE.
Press Settings.
Press More settings.
Press Text messages.
Press Message centre.
2. 2. Set the message centre number
Key in +6421600600 and press SET.
+6421600600
3. 3. Return to the home screen
Press the Home key to return to the home screen.