Why can't the phone book send messages directly after Apple 6s upgrades ios 1 1?

It may be in the internal buffer of the phone. Just wait a little longer or try to restart it.

Of course, you can also do this:

1. In the call log interface, click the I icon on the right side of the call log.

2. Click to open the contact details.

3. On the details page, click "Send SMS" to send SMS to the other party.

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What should I pay attention to when upgrading the mobile phone system?

Pay attention to important user data such as mobile phone address book, text messages and pictures. Although the upgrade will not erase the information in the mobile phone, in order to prevent accidents, it is still necessary to back up in advance.

Also pay attention to the power of the mobile phone. In order to ensure the smooth completion of the upgrade, it is necessary to ensure that the remaining power of the mobile phone is above 50%.

Pay attention to the online upgrade of mobile phones and download and upgrade the mobile phone system wirelessly.