Does it cost money to send text messages on Apple's mobile phone? Or just traffic?

If it is also an ios system or an Apple series product, using the iMessage that comes with the system requires no money, only traffic.

IMessage activation method:

1, so as to open Settings → Information →iMessage, and then it will show that it is waiting for activation.

2. After successful activation, you can see that the switch of iMesaage is on.

3. When the iMessage service is successfully activated, you can send iMessage information to your friends. However, there is also a prerequisite for sending iMessage, that is, the other party also uses iPhone and has also opened iMessage information service.

4. Find the Info icon on the iPhone home screen, and then click Open.

5. Select a friend who wants to send iMessage. The operation is the same as sending normal SMS. The iMessage message will be displayed in blue, and the word iMessage will appear in the SMS input box.