Using WiFi in The USA

If you are just using local wifi connection, you only need to choose the relevant connection and enter any required password. There is no need to change any settings otherwise - it's a bit like signing on to your home network for the first time.

An APN change is only required if you want to use Mobile Data while roaming in the USA.
You can use Wi-Fi networks with Mobile Data turned OFF.

Without an add-on for your plan, you won't be able to make/receive calls, or send text messages if you're roaming outside the EU.

Have a good trip to the US CareenL_1770108.