Award for Community Excellence 2019 Achiever* *The views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.
You are definitely under some misconceptions. Once you leave the ATT network, you can get hit with some extremely high rates. If you want to avoid that completely, put your phone in airplane mode and turn on wifi. Only use free wifi hotspots while overseas.
"Customers helping customers; not always successfully"
@tinojr as others before me have pointed out, using your AT&T sim card for roaming outside of the USA can be quite expensive. One alternative is to use a local sim card (of UK or Italy where you are traveling) but that will need your device to be unlocked. AT&T will not unlock your device unless the device is out of contract or all installments are paid off - even if you need the device for a short period of time. This is very much unlike some of its other competitors like Verizon or T-Mobile who will gladly unlock their device for internation travel.