Can you use two SIMs at once? A plain guide to dual SIM
Dual SIM means your phone holds two lines. It does not mean both work the same way at the same time. Here is what actually happens when you run two.
eSIM in Italy: coverage, networks and what to expect
Italy has four competing networks and excellent urban coverage. The gaps are where you'd expect — mountains, small islands and the roads between hill towns.
Italy is well served. Four operators compete hard, urban coverage is fast and dense, and an eSIM will have you connected before you clear the airport.
The gaps are geographic rather than technical, and they are entirely predictable once you know where to look.
Check this first
EU plan? Italy is included at your domestic rate under EU roaming rules. Buy nothing.
UK plan? Check — post-Brexit arrangements differ by provider, and some charge a daily fee.
Anywhere else? A travel eSIM will cost a fraction of carrier roaming.
The networks
Four operators run infrastructure: TIM, Vodafone, WindTre and Iliad.
TIM and Vodafone have the broadest reach, particularly in the south and on the islands. WindTre is strong in the north and in cities. Iliad is the newest and leans on partner coverage in some rural areas.
For Rome, Florence, Venice and Milan the difference is negligible. For Sardinia, inland Sicily or the Dolomites, TIM or Vodafone is the safer bet.
Where it works well
All the major cities, the entire Rome–Florence–Venice corridor, and the Amalfi and Ligurian coastal towns themselves. The high-speed rail line between Milan, Bologna, Florence, Rome and Naples has good coverage for most of the route, with the usual tunnel interruptions.
The Rome and Milan metros have mobile coverage on most lines, which is not true everywhere in Europe.
Where it gets thin
- The Dolomites and the Alps. Valleys and villages are generally fine; the passes and trails between them are not.
- Sardinia's interior. The coasts are well covered, the middle of the island much less so.
- Inland Sicily and the smaller surrounding islands.
- The roads between Tuscan and Umbrian hill towns. The towns have signal. The winding gravel roads you take to reach them often do not.
- Long rail tunnels, which on the Alpine routes can mean several minutes at a time.
If you are driving in Tuscany, download offline maps before you set off. This is the single most common Italian connectivity complaint and it is entirely avoidable.
How much data you need
A week of city sightseeing tends to land around 3–5 GB. Italy pushes maps usage higher than most — the cities are dense, the street layouts are old, and almost everyone navigates on foot with a phone in hand.
Add a couple of gigabytes if you are driving between regions.
Before you fly
- Check whether your existing plan already covers the EU.
- Confirm eSIM support and that your phone is unlocked.
- Install while you still have Wi-Fi.
- If you are heading to Sardinia, Sicily or the mountains, check which network your plan uses.
- Turn data roaming off on your home line; leave the line on for texts.
Do you need an Italian number?
For a holiday, no. Museum tickets, trains, restaurants and transfers are all bookable online, and the apps work the same as at home.
You need one for a long stay, a rental agreement, or anything involving Italian administration — and for a month or more, a local SIM bought in a shop will be cheaper than a traveller plan as well as giving you the number.
Common mistakes
- Paying twice because an EU plan already covered the trip.
- Driving Tuscany without offline maps.
- Assuming island coverage matches the mainland.
- Leaving home-line data roaming enabled.
