Apple 5 can send and receive Imessage messages normally, but it can't send messages to others actively. What happened?

Try to use the email number, that is, APPLE ID, as the IMESSAGE number. Using mobile phone number is easy to make mistakes. Settings-There are options in the SMS, so you can have a look. As long as the other party is above IOS5.0, IMESSAGE is activated, enter the number of the other party, and the system will automatically identify whether IMESSAGE can be sent. If so, the send button will automatically turn blue. As long as there is a network, you can send messages, including mobile 2G networks.