"Avoid roaming charges" is usually shorthand for "I just got a $400 bill after a weekend in London and I never want to do that again." The good news: four different ways to skip it exist, each cheap, each right for a different trip shape. Here's the full map.
Why roaming charges hit in the first place
When your phone is abroad with Data Roaming on and no travel plan active, your home carrier bills per-MB at international rates — often $5 to $10 per MB. A single Instagram auto-refresh over LTE can use 20-50 MB. Overnight, your phone can sync email, auto-update apps, download photos to iCloud, and rack up hundreds of dollars before you've noticed.
This is the default behavior on US carriers if you've never enabled any international plan. It's avoidable — but only if you do one of the four things below before leaving, or during, the trip.
Option 1: Travel eSIM (best for most leisure trips)
Buy a data plan for your destination country or region from a travel eSIM provider. The QR code arrives in your email within a minute; you install it on your phone before you fly; the plan activates on the first tower in the covered country.
Typical costs:
- 1 GB for 7 days: €2 to €6
- 5 GB for 30 days: €10 to €20
- Unlimited for 7 days: $20 to $50
What it saves: compared to US carrier day-pass rates, a week-long travel eSIM saves $30 to $60 on an average trip. Compared to paying per-MB, it saves anywhere from $50 to several thousand depending on usage.
Setup time: 60 seconds to install. Works on any iPhone since XS and most Android flagships since 2020. Full walkthrough: iPhone install guide | Android install guide.
Best for: 3-day to 3-week leisure trips, multi-country regional trips, trips where you want your home number still active for 2FA.
Drawback: requires a compatible phone (check here) and planning the purchase before you fly.
Option 2: Carrier international day-pass (simplest for short business trips)
Your US carrier's international plan typically costs around $10 per day of use. On days you use international data, the phone's full home plan applies — home speed, home data allowance, home features.
Verizon TravelPass: $10/day in 210+ countries. Full plan speed and allowance.
AT&T International Day Pass: $10/day in 210+ countries. Full plan speed and allowance.
T-Mobile Magenta: free slow-speed data (128 kbps) included in 200+ countries. Magenta MAX and Go5G Plus include faster speeds in specific countries.
Google Fi Flexible: $10 per GB internationally, same as domestic. No day-pass structure.
Setup time: usually zero — activates automatically when the phone uses data abroad. Some carriers require enabling in the app first.
Best for: 1-2 day trips, business travel where setup time matters more than saving $30, travelers who've put off planning.
Drawback: cost adds up quickly. Seven days of TravelPass is $70, comparable to an unlimited travel eSIM plan — and much more than a standard data-allowance travel eSIM plan.
Detailed cost comparison: eSIM vs international roaming.
Option 3: Local prepaid physical SIM (cheapest for long stays)
Buy a prepaid SIM card in-country, usually at an airport kiosk or a carrier's store. Local pricing applies, which is often dramatically cheaper than anything marketed at tourists.
Typical costs (varies hugely by country):
- Thailand: ฿299 (~$8) for 30 days unlimited data on AIS or TrueMove
- Vietnam: ~$5 for 30 days with 60+ GB on Viettel
- UK: £10 for 10 GB / 30 days on Vodafone or O2 tourist SIM
- USA (for visitors): ~$30-50 for 30 days on T-Mobile prepaid or Mint Mobile
Setup time: 10-30 minutes at a kiosk (ID check, provisioning, sometimes passport photo for local regulations).
Best for: month-plus stays, digital nomads, travelers in markets with cheap local prepaid, anyone comfortable dealing with a carrier kiosk in a new country.
Drawbacks: requires carrier-unlocked phone, takes time on arrival, removes your home SIM for the trip unless your phone supports dual-SIM. Some countries require passport registration (Cambodia, Thailand, Vietnam, UAE).
Option 4: Wi-Fi only (free, limited)
Free Wi-Fi is available at most airports, major train stations, hotels, cafes, and many restaurants worldwide. Apps like Google Maps and Apple Maps support offline map downloads. Messaging apps (WhatsApp, Signal, iMessage over Wi-Fi) work normally.
Cost: free.
Setup time: zero — turn cellular off and connect to Wi-Fi where available.
Best for: very short trips where you're mostly in a hotel, budget travelers who are comfortable without continuous connectivity, photographers on working trips where connectivity is a distraction.
Drawbacks: no rideshare apps outside Wi-Fi zones, no real-time navigation between spots, no emergency connectivity. Works until you need data between stops. Most travelers who try Wi-Fi-only for a week switch mid-trip.
The EU exception: roam-like-at-home
If you're an EU resident on an EU carrier plan, none of the above applies inside the EU. Roam-like-at-home regulation (2017) makes your home plan work identically in all 27 EU states plus Iceland, Liechtenstein, and Norway. Same speeds, same data allowance, no extra charge.
This does not apply to non-EU residents visiting the EU, and it doesn't apply to EU residents traveling outside the EU.
If you live in Berlin and go to Barcelona: do nothing, your home plan works. If you live in Boston and go to Barcelona: see options 1-4.
Which one for your trip
Weekend trip (2-3 days): Carrier day-pass if your home plan is full-tier, travel eSIM if you want to save. Day-pass wins on simplicity; eSIM wins on cost.
Week-long vacation (5-10 days): Travel eSIM. Saves $30-50 over day-pass rates, keeps your home line active for 2FA.
Three-week trip: Travel eSIM or local SIM. eSIM if you want convenience and coverage from day one; local SIM if you're in a cheap-prepaid market and comfortable with the kiosk visit.
Month-plus stay: Local prepaid physical SIM almost always wins on cost. Pair with a short travel eSIM for the first week while you get oriented and buy the local SIM at a carrier store.
Multi-country regional trip (e.g., Europe or Asia): Regional travel eSIM. One plan covers the whole trip without switching. Works especially well for Europe + Balkan or Middle East itineraries.
Remote destinations with weak coverage: Check the country's destination page for partner carriers before buying anything. Some remote areas have very thin eSIM support and a local SIM on the dominant carrier is the only practical option.
The do-before-you-fly checklist
- Turn off Data Roaming on your home SIM. Settings → Cellular → home SIM → Data Roaming → off.
- Decide which option from 1-4 above fits your trip.
- If travel eSIM: buy from a provider, install the QR on home Wi-Fi, label the line. Full iPhone walkthrough.
- If day-pass: confirm it's enabled in your carrier's app. Some require pre-activation.
- If local SIM: confirm your phone is carrier-unlocked.
- Download offline maps for your destination (Google Maps → search city → menu → Download offline map).
Nothing about this is complicated once you've done it once. The first time, it feels like overkill — until you see what an un-managed roaming bill looks like.
For trips where the travel eSIM is the right call, 99esim covers 155 countries and 9 regional bundles. A typical 5 GB / 30-day plan runs €10 to €20 depending on country — less than a day and a half of Verizon TravelPass.