How can i update my iOS version

Go to Settings/General/About and note the iPhone Model Name, then check its version compatibility from this list:

• iPhone 8 or newer, including SE 2nd and 3rd editions, you can update to 16.5.1(c)
• Any iPhone series 6S and 7, and original SE: You can update to 15.7.7
• iPhone 5S or 6: You cannot update to iOS 13 or higher; you can update only to iOS 12.5.7
• iPhone 5: You can update only to 10.3.4
• iPhone 5C: You can update only to 10.3.3
• iPhone 4S: You can update only to 9.3.6
• iPhone 4: You can update only to 7.1.2

If your phone is eligible to be updated go to Settings/General/Software Update and follow the instructions.

We don't know what iPhone model that you have. We need that information from you.

Settings > General > About > Model Name

However, if you have an iPhone 6 or iPhone 6 Plus, we can tell you now that the phone can only be updated to iOS 12.5.7

I went to update my iOS version