why can’t iphone 6 get ios 13

Your iPhone 6 has hardware that will not be able to support iOS 13 and its operation efficiently. iOS 13 needs future generation (Newer than iPhone 6) hardware to work normally.

Axel F.

Because it doesn’t have the required hardware, in this case it doesn’t have enough RAM.

Because iOS 13 requires atleast 2 GBs of RAM, the iPhone 6 has only 1 GB of RAM.