I can’t download iOS 13 on my iPhone 6 Plus

Unfortunately, your phone model does not support iOS 13. It is only available on the year model after yours (6s) and later.

That is correct. Your iPhone 6 cannot be upgraded past iOS 12.4.6. If you need to use a newer version of iOS, you will have to get a newer phone.

That is correct. Your iPhone 6 Plus can only go as high as iOS 12. You will need a newer iPhone model than yours to move to iOS 13.

Axel F.

The iPhone 6 does not have sufficient RAM to run iOS 13

It is now up to 12.4.8

Thanks!