Is it safe to charge my iPhone 16 with 230 volts?

The Apple power adapter will run on 100-240 Volts and 50/60 Hz, so all you need is the wall plug adapter.

Actually, you likely won't even need a wall plug adapter since Antiqua uses Type A and B wall sockets.

Where are you traveling from?

If traveling from the US or Canada, Antigua uses the same two- and three-conductor plugs as the US, though at higher voltage.

The US and Canadian Apple iPhone chargers will plug in and will work without requiring a socket adapter or voltage conversion.

From other countries? It varies.

Yes. You can use a plug adapter and do not need a voltage converter.