Please update my iphone6 to ios 13

This is not possible.

The iPhone 6 can only be updated to iOS 12.5.5. That is the end of the update road for the iPhone 6.

An iPhone 6 isn't capable of 13 or above.

(223940)

Bob, just for clarification:

Since yesterday, iOS 12.5.6, as per this article:--> About iOS 12 Updates - Apple Support

Giulio

Thanks!

👍