i have an iPhone 6 can I update to a 13 iso version. I need for mobile banking

Hello iphone 6 can only suport till the ios 12 check this informarion https://support.apple.com/en-us/HT201222

The iPhone 6 can not be updated beyond iOS 12.5.1. If your banking app requires iOS 13, you will need a newer device.

No. An iPhone 6 cannot update beyond iOS 12.5.1.

12.5.1 is the most current iOS version it can run.

If you need iOS 13, then you need a newer iPhone. iPhone 6s or later.