How to delete iphone6 SMS automatically?

This is caused by personal settings, and you can modify the SMS retention time. Apple iphone6 automatically deletes historical short messages. The steps are as follows: 1. Enter the settings on the mobile phone, select the information option to enter, and click Save Information. 2. Here, you can see that the default value is permanent. Click to change it to one year. 3. When prompted, confirm the deletion. After modification, the information will be kept for one year. After the expiration of one year, this information will be automatically deleted.