How can I update my phone?

I have an iPhone 7 and I know it should be updated to IOS 11 or whatever but for a while I didn't have Wi-Fi to keep my phone updated and when I finally could update it it only updated it to IOS 10.3.3 and it just tells me my phone is up to date even though I know it's not… What can I do?

Get iPhone X like me. I traded in my 7 Plus today. I've had the iPhone X since Friday

I'd try restarting it to see if that helps. Try quitting the apps before restarting.

Don't see a reason why an iPhone 7 would say that. I also have one & its on iOS 11.1 now, no problem.