A text message is a message that can be sent to other mobile phones. If you can't send and receive text messages as soon as you've inserted your SIM, you need to set up your phone for text messaging.
Press the message icon.
Press the new message icon.
Press the field next to "To:" and key in the first letters of the recipient's name.
Press the required contact.
Press the SIM drop down list.
Press the required SIM.
Press the text input field and write the text for your SMS.
Press the send icon when you've finished your SMS.
Slide your finger upwards starting from the bottom of the screen to return to the home screen.