Staying connected abroad
eSIM and mobile data abroad
The moment you land, your phone decides whether this trip starts with a working map or a surprise bill. Here is how to make it the map: which way to get data, how much you actually need, and what it should cost.
Picture the arrivals hall. Everyone around you is doing the same small dance: airplane mode off, and then either a map loads or a message pops up telling you today’s roaming costs $12. That one toggle is the difference between a smooth first hour and the most expensive gigabytes you will buy all trip, and it gets decided before you have found the exit.
It does not have to be a gamble. Getting online abroad comes down to three choices, and picking the right one is usually the single easiest way to save real money on a trip: the gap between the worst option and the best is often ten to one. This page walks through it in the order the decision actually happens. First the three ways to get data and when each one wins. Then a plain look at what your phone really burns in a day, so you buy the right amount instead of panic-buying twenty gigabytes. Then real 2026 prices by region and country, and the ten-minute setup that happens at home instead of at an airport counter. The prices and country rules below come from verified provider data across 143 countries, checked against the providers’ own pricing in 2026.
eSIM vs local SIM vs roaming
Every traveler has the same three options, and the search results treat them like a matter of taste. They are not. Each one wins in a specific situation, and one of them loses in almost all of them. The short version: an eSIM is the default for most trips, a local SIM beats it on long stays and heavy data, and roaming is what you pay when you did not decide in advance.
Travel eSIM
Best for most trips- Installed at home in 5 minutes, works on landing
- From about $1 per GB in Southeast Asia and Europe
- Your own SIM stays in: home number keeps receiving codes
- No counter, no passport queue, no tiny plastic to lose
- Catch: needs an eSIM-capable, carrier-unlocked phone
Local SIM
Best for 3+ weeks or heavy data- Unbeatable floor: Vietnam 30 GB under $3, India 56 GB for $4
- Local number for taxi apps and reservations
- Best rural coverage on the strongest local network
- Catch: passport registration, airport queues, your home SIM sits in a pocket
Roaming
Short work trips only- Zero setup: your number, your plan, your voicemail
- Around $12 per day on the big US carriers
- Two weeks costs $168; a month costs more than most flights
- Exception: intra-EU roaming is free on EU plans
What your phone burns
A day of data, from cheapest to most expensive
Once you have picked how to get data, the next question is how much, and this is where most people overpay. They buy the way they pack: by fear, ending up with a 20 GB plan for a trip that uses six. The truth is calmer. Only one habit on your phone is genuinely expensive. Here is what a normal travel day burns, per hour, from the thing everyone worries about to the thing that quietly runs up the bill.
Work out your data and compare plans
The catch is that no two travelers have the same mix. A backpacker who films everything and calls home nightly needs three times what a museum-and-messaging traveler does. That is what the calculator below is for: you set how much you navigate, scroll, stream and call, the same habits above, and it turns them into a realistic GB estimate, then puts the eSIM plans and local SIM prices for your destination right next to that number, across 146 countries. The answer stops being “data is cheap in Asia” and becomes “for your trip, buy this much, this way.”
Tool not loading? Open the full calculator in a new tab. Budgeting the whole trip? The trip budget calculator includes connectivity as a cost line.
What mobile data costs around the world
Data prices follow geography, and the pattern is stark: the regions most people worry about are the cheap ones. Southeast Asia and Europe both bottom out around $1 per GB on entry eSIM plans, while the Caribbean and Africa run five to six times that. The table shows the cheapest available eSIM rate per GB and the spread, from the four providers behind the calculator (Airalo, Saily, Yesim and GigSky, April 2026 pricing).
| Region | Cheapest eSIM rate | Typical range per GB | Read |
|---|---|---|---|
| Southeast Asia | from $0.98/GB | $1-$7 | Cheap everywhere; local SIMs cheaper still |
| Europe | from $0.98/GB | $1-$2.50 | Regional EU eSIMs cover 30+ countries in one plan |
| East Asia | from $1.08/GB | $1-$4 | Japan and South Korea around $1.80/GB |
| Middle East | from $1.08/GB | $1-$4.50 | Fine prices, but read the VoIP warnings below |
| South America | from $2.45/GB | $2.50-$6.50 | Local SIMs often halve these prices |
| Central America | from $2.81/GB | $3-$7 | Costa Rica’s local Claro: 10 GB for $9 |
| Caribbean | from $1.94/GB | $2-$20 | Widest spread; check your island, not the region |
| Africa | from $1.22/GB | $1-$12 | Egypt and Morocco cheap; safari countries expensive |
Per country the eSIM-versus-local-SIM verdict flips more often than the averages suggest. A few concrete pairings from the dataset, all 30-day windows unless noted:
| Country | eSIM (best entry plan) | Local SIM (cheapest solid option) | Verdict |
|---|---|---|---|
| Thailand | from $0.49/day (0.5 GB daily) | AIS: 15 GB / 8 days, $9 | Local SIM for stays over a week |
| Vietnam | from $0.49/day (0.3 GB daily) | Viettel: 30 GB / 30 days, $2.70 | Local SIM, easily |
| Japan | Yesim: 10 GB / 30 days, $18 | IIJmio: 3 GB / 30 days, $17 | eSIM; local SIMs are paperwork-heavy |
| Spain | from $0.49/day (0.5 GB daily) | Movistar: 10 GB / 30 days, $10 | eSIM short stays, Movistar longer |
| Mexico | Yesim: 5 GB / 15 days, $19 | Movistar: 6 GB / 30 days, $8 | Local SIM wins on price |
| Australia | from $0.49/day (0.4 GB daily) | Optus: 20 GB / 28 days, $20 | eSIM short trips, Optus for road trips |
| United States | from $0.49/day (0.5 GB daily) | T-Mobile prepaid: 10 GB, $40 | eSIM; US prepaid is overpriced |
| India | from $0.49/day (0.3 GB daily) | Jio: 2 GB/day / 28 days, $4.15 | Local SIM if you can sit out activation |
On the same two-week trip, roaming day passes cost around $168 and an eSIM covers it for under $20. Same phone, same country. The only difference is whether you decided before the flight.
Big-carrier roaming at ~$12/day vs an entry eSIM, per the provider dataset
Set it up right: the 10-minute checklist
The whole eSIM advantage is that the work happens at home, on WiFi, with your coffee. Done in order, this takes about ten minutes and means you land already connected.
Check your phone twice
First that it supports eSIM (iPhone XS and newer, most flagship Androids since 2019), then that it is carrier-unlocked. A financed phone locked to your carrier will install the eSIM and refuse to use it. Dial *#06#: if an EID number shows, the hardware side is fine.
Buy and install before you fly, activate on landing
Most travel eSIMs start their validity clock at first network connection, not at purchase. Install at home, keep the line switched off, flip it on when the wheels touch down.
Set the eSIM as your data line, keep your home SIM on
In dual-SIM settings: mobile data on the travel eSIM, your home number active but with data roaming off. Banking codes, WhatsApp verification and 2FA texts keep arriving; the expensive line just never touches data.
Turn off auto-updates and cloud photo sync on mobile data
One app store update cycle can eat a day’s budget. Both are one toggle in settings, and WiFi picks them up at the hotel.
Screenshot the plan details
The APN settings, the plan’s top-up page and the provider’s support address, saved to photos. When something fails, it fails in a place without data.
Country rules that catch travelers out
Most of the world sells a SIM the way it sells a coffee. A handful of countries have registration rules or app blocks that surprise even experienced travelers, and they are exactly the places where fixing it mid-trip is hardest. These warnings ship with the calculator’s country data; the big ones deserve print.
- China blocks Google, WhatsApp, Instagram and most Western apps. A regular local SIM puts you behind the Great Firewall. Some travel eSIMs (Airalo among them) route through Hong Kong and bypass it; otherwise install and test a VPN before you land, not after.
- Indonesia requires IMEI registration for foreign phones. Without it your SIM can stop working after 90 days. Irrelevant for a two-week Bali trip, essential for long-stayers.
- Turkey wants foreign phones IMEI-registered after 120 days, and the registration costs several hundred euros. Short trips: ignore. Wintering in Antalya: use a Turkish SIM from the start.
- The UAE blocks VoIP calls. WhatsApp calls, FaceTime and Skype do not connect; only the local du and Etisalat calling packages work. Messages and data work fine. Morocco and Egypt restrict VoIP calling similarly (a VPN restores it).
- India ties SIM purchases to biometric verification, and activation can take up to 24 hours. If you need data from minute one, land with an eSIM and buy the Jio SIM the next day.
The short answer, if you just want one
For most destinations on this page, where the verdict lands on eSIM, Saily (by NordVPN, Trustpilot 4.7 from about 24,700 reviews) is the safe default among the providers tracked here: fair prices, an app that shows live usage, and plans in nearly every country. Still worth comparing per country in the calculator above, but if you would rather not, this is the one to buy.
Get a Saily eSIM →Affiliate link: if you buy through it, Pack Lightly may earn a commission at no extra cost to you. It never changes what we recommend.
Keep planning
SIM and eSIM guides by country
The verdict per destination
Tools that help you plan
Common questions
01Is an eSIM better than a physical SIM for travel?
For most trips up to a month, yes. An eSIM installs at home in minutes, works the moment you land, and leaves your own SIM active so banking codes and WhatsApp keep working. A physical local SIM wins on price for long stays or heavy data in cheap-telecom countries like Vietnam, India and Mexico, where 30-day plans cost $3 to $9. The trade-off is airport queues, passport registration and your home number going dark.
02How many GB do I need for a two-week trip?
Around 8 to 10 GB covers a typical two-week trip: an hour of navigation (about 5 MB per hour), an hour of social scrolling (about 150 MB per hour), messaging and a short video call per day lands near 400 MB daily, plus a 20% buffer for unreliable hotel WiFi. Streaming video is the exception: an hour a night can double the total. Heavy streamers should budget 15 to 20 GB.
03Does my phone support eSIM?
iPhone XS (2018) and newer, Google Pixel 3 and newer, and most Samsung flagships since the S20 support eSIM. Dial *#06#: if an EID number appears, the hardware supports it. The second requirement matters just as much: the phone must be carrier-unlocked. A phone still being paid off through a carrier is often locked and will refuse a travel eSIM even though it can install one.
04Is roaming ever worth it?
In two cases. First, inside the EU on an EU plan, where roaming is free by law and nothing needs arranging. Second, on very short trips (two or three days) where a $12-per-day pass costs less than the hassle of setting anything up. Beyond that the math collapses: two weeks of day passes runs around $168, ten times the price of an eSIM covering the same trip.
05Can I keep my own number for WhatsApp and banking codes?
Yes, and this is the eSIM’s quiet superpower. In dual-SIM settings, keep your home SIM active with data roaming switched off and route all mobile data through the travel eSIM. Your home number still receives SMS verification codes at no cost, and WhatsApp stays registered to it regardless of which line carries the data.
06Should I buy the eSIM before I fly or after I land?
Before, always. Install it at home on WiFi, where the QR code, the provider app and your patience all work. Most travel eSIM plans start counting validity at first network connection, not at purchase, so installing early costs nothing. Landing with a working line means the taxi app, the maps and the booking confirmation all work from the arrivals hall.