Do you want to update 14.4. 1 for Apple 7?

If your iPhone7 is still an old system, there is no need to upgrade, because the old system consumes less system resources; However, new systems such as iOS 14 and iOS 15 introduce more dynamic designs, so the consumption of system resources will be higher, and the experience after upgrading may be relatively poor, so upgrading is not recommended.

If your iPhone7 is iOS 14, you can try to upgrade to iOS 15. The difference between the two systems is not very big, but iOS 15 has done a lot of optimization and BUG fixes for the previous version, so the upgraded experience may be better; However, it should be noted that iOS 15 is still being tested, so there is still instability.