iOS app need to update from

You have an iPhone 6 with iOS 12 installed. Your iPhone cannot be updated anymore. The iPhone 6 can only be updated up to iOS 12 like you have already done. You will require a newer model of iPhone to install higher iOS version(s).

Axel F.

Ralph1025 wrote:

iOS update app download iPhone 15! iOS version

No. You will need to access Facebook through a browser. Or, get a new phone.