The mobile phone is off, and there is wifi. How can I send messages to others? .

If your mobile phone number fee stops. But now you can surf the Internet wirelessly. If you send a text message directly, you can't send it out. Because there is no charge for your mobile phone number, how can I send the message? But you can send short messages with some short message software. Because of this, he only consumes traffic, not telephone charges. Therefore, it is no problem to send text messages with these softwares when the mobile phone is dead. For example, you can send a flying letter from China Mobile. In other words, you can use other chat software to send messages to others. But if I send you a text message directly from my mobile phone, it won't work either.