What if iPhone 6 can't delete SMS?

Hello, please try the following methods:

1. Enter the iPhone6 desktop interface, and then find and click enter information. In the iPhone6 SMS interface, click Edit in the upper left corner, as shown in the figure below.

Secondly, next, we check the messages that need to be deleted. If messages need to be deleted in batches, check multiple messages that need to be deleted at the same time. Click Delete in the lower right corner after completion to delete all messages in batches, as shown in the figure below.

The above is the way to delete iPhone6 SMS, I hope it can help you.