"Is 5 GB enough?" "Do I need unlimited?" It's the first question everyone asks when booking an eSIM. Pick too small and you're stuck on airport WiFi for the second week of your trip. Pick too big and you're paying for data you'll never use. This guide breaks down what you actually consume abroad — by activity, by trip type, and by how you travel.
First: what uses data, and what doesn't?
Not all apps burn through your bundle at the same rate. Here's roughly how much data common activities use per hour:
| Activity | Data per hour | Notes |
|---|---|---|
| WhatsApp chat / iMessage | ~5 MB | Text is tiny |
| WhatsApp voice call | 15–30 MB | Very efficient |
| WhatsApp / FaceTime video call | 150–300 MB | Adds up on long calls |
| Google Maps navigation | 3–5 MB | Smaller than most think |
| Spotify (normal quality) | 40–80 MB | Download playlists at home |
| Instagram / TikTok scrolling | 300–800 MB | The biggest surprise |
| YouTube (standard) | 500 MB – 1 GB | Depends heavily on quality |
| Netflix (standard) | 1 GB | Definitely use WiFi |
| Email / web browsing | 10–30 MB | Light unless you load videos |
The usual suspects that blow through a bundle: short-form video apps (TikTok, Instagram Reels, YouTube Shorts) and streaming music without downloaded playlists. Navigation and messaging barely register.
By trip type
Here's a realistic estimate based on how most people actually travel. These assume you're using hotel and cafe WiFi for heavy things (Netflix, big downloads, photo backups) and your eSIM for on-the-go stuff.
City break (3–5 days)
Typical usage: 2–5 GB
Maps, restaurant bookings, Uber, sharing photos on WhatsApp, a bit of scrolling on the metro. WiFi in hotels and cafes covers the rest. A 5 GB bundle is plenty for most city breaks.
Standard two-week holiday
Typical usage: 10–15 GB
Daily navigation, video calling family, posting stories, checking flights. If you're on the beach with nothing else to do, Instagram will quietly eat a couple of gigs a week. A 10–20 GB bundle gives you breathing room.
Road trip or national parks
Typical usage: 15–25 GB
More navigation (often for hours a day), offline map downloads, and tethering a second phone or tablet. National park WiFi is often non-existent, so everything goes through your eSIM. Pick 20 GB or unlimited.
Digital nomad / working remotely
Typical usage: unlimited
Video calls, file sync, Slack, cloud tools — this adds up fast. Even with cafe WiFi for deep work, you'll burn 30–50 GB a month on the move. Get an unlimited or monthly bundle.
Cruise or all-inclusive resort
Typical usage: 1–3 GB
Most of the time you're on ship WiFi or hotel WiFi. An eSIM is mostly for port days and excursions. A small bundle is enough.
Things that quietly eat your data
Even if you plan carefully, these background gremlins can drain a bundle:
- Automatic photo backup — iCloud and Google Photos can upload several GB without you noticing. Turn off "use mobile data" for backups.
- App updates over cellular — a single app update can be 500 MB. Set updates to WiFi-only.
- Video autoplay — Instagram, Facebook, and X all autoplay video. Disable this in each app's settings.
- Maps that re-download — if you don't download offline maps ahead of time, Google Maps re-fetches tiles every time you zoom.
- WhatsApp media auto-download — a single group chat can dump hundreds of photos onto your phone. Set auto-download to "WiFi only."
Spending 10 minutes tweaking these settings before you leave can save you a gig or two per week.
WiFi changes everything
The single biggest factor in how much data you actually use is how much WiFi you have access to. A hotel with fast WiFi in the room can cut your cellular usage by 80%. A boutique guesthouse with no WiFi at all and you're suddenly leaning on your eSIM for everything.
Before you book, a quick sanity check:
- Does my hotel have WiFi in the room (not just the lobby)?
- Will I be in cafes and restaurants with free WiFi?
- Am I visiting places without WiFi (beaches, parks, hikes, long drives)?
If the answer to the last one is "mostly yes," round up your estimate.
When to just pick unlimited
If any of these apply, don't bother calculating — get unlimited:
- You're working remotely or tethering a laptop regularly
- Your trip is longer than 3 weeks
- You're visiting places with unreliable WiFi (national parks, rural areas, small islands)
- You just don't want to think about it
The premium for unlimited over, say, 20 GB is usually small — and the peace of mind is worth it.
A simple rule of thumb
Still can't decide? Here's a starting point:
Take the number of days of your trip and multiply by 1 GB. Round up to the nearest available bundle size.
A 10-day trip → 10 GB. A 3-week road trip → 20 GB or unlimited. It slightly overestimates for casual travelers and slightly underestimates for heavy users, which means most people end up with about the right amount.
FAQ
Can I top up if I run out mid-trip? Yes. Most eSIM providers, including us, let you top up from your account without reinstalling. Takes a minute.
Does WhatsApp calling count against my bundle? Yes, but it's very light — voice calls are about 20 MB per hour, video calls 150–300 MB per hour.
What if I only use WiFi and almost no data? Even then, buy the smallest bundle — you want mobile data for emergencies, Uber, maps, and the moments between WiFi networks.
Is 5G bundled data more expensive? Usually no. Most eSIM bundles include 5G where available at no extra cost. 5G is faster, not more expensive.
Conclusion
Most people overbuy data for city trips and underbuy for road trips. Think about how you actually travel — not what you fear you might do — and multiply by 1 GB per day as a starting point. Still unsure? Go unlimited. It's cheap peace of mind.
Ready to pick a bundle? Check out our eSIM options for your destination.