Is it safe to make orders internationally?

The iPhone 11 can currently be updated to iOS 16.4.1. Apple has not announced how log that device will be upgradable.

As for your original question - is it safe to make orders internationally - Apple will not ship internationally. If you are considering buying that iPhone used, please consider the information in this article:

The All Too Common SAD Reality of Buying … - Apple Community

Apple does not ship internationally, and can reject orders being shipped to freight-forwarding firms.

The Apple warranty for iPhone is not international.

What any iPhone ships from the factory with for memory and storage is what it will have; no upgrades.

iOS upgrades are generally available five to seven years.