Welcome to TinyDeal，
First you could unlock the phone and press the SMS. When you are in the state of SMS
1. Open the message and press the "option” and choose the " Insert object "
2. You will see "Picture" or "Predefined animation". Press the button and choose the expression. At this way you can input expression on the phone. When you want to enter punctuation marks, you can try this. You can switch to digital input method in the lower left corner by pressing “english”. When the button becomes “.?
Any questions please contact us by Customer Service Express: https://help.tinydeal.com/contact-us