Why can't I send a text message to the ipad air2 Hong Kong version of the 4g card?

Ipad can't use SMS service to send short messages like a mobile phone with an Internet card, and can only send short messages through iMessage.

The steps for setting iMessage are as follows;

1. Click to enter the homepage setting icon.

2. Find the message option and click Enter.

3. Click Enable iMessage.

4. Enable "Send Read Receipt" (let the other party know that the mail has been read).

5. Enable the receiving method, which is used to change or increase the email address in iMessage.

6. You can log in with an Apple ID. If not, you will be prompted to create and register according to the prompts.

7. Then enter the normal SMS interface and send a message. If the other party has enabled iMessage, it will be automatically converted to iMessage, and the color is blue, which is different from the green of normal SMS.

Note that the device must be connected to the network when it is used, and the object receiving the information is also connected to iMessage to realize this operation.