Iphone 6s can receive text messages, but when sending text messages to others, the other party can't receive them. What is the reason?

If the current network signal is not good, the information will not be transmitted.

Before recovery, shut down all networks, including WiFi, traffic and other networks. Then click Settings. Click General. Click Restore. Restore all settings. After the mobile phone is automatically turned off and restarted, it can be disinfected three times in a row.

Or open settings, information,? IMessage, send the read receipt as a short message. Send and receive MMS, display the subject bar and number of words, and return to the settings page to open privacy. Then turn on the location service, turn it off for 3 minutes and then turn it on again. After the restart, turn on the airplane mode and then turn it off.