What if I can't open the SMS after upgrading ios 10?

This is mainly the problem of system instability.

Ios 10 SMS failed to send solution:

This may be a bug after ios 10 upgrade, but there is still a solution. Don't be sad about fruit powder.

Method 1:

Settings-General-Restore-After all settings are restored, the SMS function returns to normal and the system becomes smooth.

Method 2:

Or you can use itunes to re-brush, restart the phone after brushing, and then restore all the settings in the settings, and that's it!