eSIM and SIM cards in Vatican City

It is Rome's network

• Vatican City is 0.44 square kilometres inside Rome, and you walk in past a line on the pavement. Your phone stays on the Italian network it was already using.
• Italy is in the EU, so roam-like-at-home applies: an EU or EEA SIM works at your domestic rates, on your domestic allowance.
• There is no Vatican SIM to buy and no reason to look for one. Vatican City has its own telephone service for the institution, not a consumer mobile network for visitors.
• UK plans are a separate question. Several UK networks reintroduced European roaming charges after Brexit, so check yours rather than assuming.

If you need a travel eSIM, buy Italy

• An Italy plan is the correct product for the whole trip, St Peter's included.
• Buy it for the length of your Rome stay, not for the afternoon inside the walls.

Inside the walls

• The Vatican Museums are dense stone and very crowded, and a signal that works outside can be poor in the galleries. Download your tickets and any audio guide before going in rather than relying on a live connection at the turnstile.
• Queue-time and ticketing all happen on your phone, which is the practical reason to arrive with working data rather than hunting for wi-fi.

eSIM

• An eSIM is live before you land and skips the shop entirely, which on a short trip is the whole argument for it.
• Check your phone takes one. Most flagship phones since 2019 do; most budget models do not.

Practical points

• Keep your home number reachable for two-factor codes. If you swap in a local SIM as your only card, bank apps that text a code to your home number stop working at the worst possible moment. A dual-SIM phone, or an eSIM alongside your home SIM, solves it.
• Wi-fi is widespread in cafes, hotels and stations.