How Much eSIM Data Do You Need? Real Numbers by App & Trip (2026)
By AeroCell editorial team · Updated July 8, 2026
"How many GB do I need?" is the question everyone asks after picking a destination — and overshooting or undershooting both cost money. Here's how to size a travel data plan properly: what each app actually burns, realistic daily profiles, and the tricks that cut usage in half.
What travel apps actually use
| Activity | Approximate data |
|---|---|
| Google Maps navigation | 3–5 MB per hour |
| Messaging (WhatsApp, iMessage — text) | a few MB per day |
| Voice calls (WhatsApp/FaceTime audio) | ~50 MB per hour |
| Email + web browsing | 50–100 MB per hour |
| Social scrolling (Instagram, TikTok) | 150–800 MB per hour |
| Music streaming | 50–150 MB per hour |
| Video calls | 300 MB–1 GB per hour |
| HD video streaming (YouTube, Netflix) | 1.5–3 GB per hour |
| Photo backup/upload | ~5 MB per photo, 100+ MB per video |
Two big lessons hide in that table: navigation is nearly free — nobody blows a plan on Google Maps — and video is everything. Your data plan is really a video-and-social budget.
Daily profiles: which traveler are you?
- Light (200–400 MB/day): maps, messages, email, restaurant lookups. Photos wait for hotel Wi-Fi. Social checked, not scrolled.
- Medium (0.5–1 GB/day): everything above plus real social time, music on walks, photo uploads as you go.
- Heavy (2 GB+/day): streaming on trains, TikTok with breakfast, video calls home, laptop hotspot moments.
Matching trip to plan
| Trip | Light user | Medium | Heavy |
|---|---|---|---|
| Long weekend | 1–2 GB | 3 GB | 5 GB |
| One week | 3 GB | 5 GB | 10 GB |
| Two weeks | 5 GB | 10 GB | 20 GB |
| A month | 10 GB | 20 GB | 50 GB |
At AeroCell prices the difference between sizes is small — USA: 5 GB $5.99, 10 GB $9.99, 20 GB $19.99 — so when between two sizes, take the bigger one. An extra 10 GB costs less than a single day of roaming; running dry on a travel day costs more in stress.
Day passes and "unlimited" plans, decoded
Besides fixed buckets, many destinations offer day passes: a full-speed allowance per day (say 1–3 GB), after which speed drops to ~1 Mbps instead of cutting off. That floor is enough for maps and messages, just not video. Day passes suit trips with a few heavy days (uploads, streaming) mixed with light ones; fixed buckets suit steady usage. Check the Day Pass tab on your destination's page to compare.
Cut your usage in half (30 minutes before you fly)
- Download offline maps for your cities (Google Maps → profile → Offline maps). Navigation then sips data instead of streaming tiles.
- Set photo backup to Wi-Fi only (Google Photos/iCloud) — the single biggest silent data eater.
- Turn off background app refresh and auto-updates on cellular.
- Disable video autoplay in Instagram/X/TikTok settings, or set data-saver mode.
- Download playlists and shows (Spotify, Netflix) over Wi-Fi for flights and trains.
- Watch the hotspot. A laptop treats your phone like home broadband — one Windows update can eat 2 GB. Hotspot deliberately, not by default.
Track it as you go
The AeroCell app shows live remaining data per plan — glance every couple of days and you'll never be surprised. Running low? Top up in seconds from the app, no new eSIM needed.
Frequently asked questions
What happens when the data runs out?
The plan simply stops (or drops to slow speed on FUP day passes) — no overage charges, ever. Top up to continue.
Does the eSIM use data when I'm on Wi-Fi?
No — Wi-Fi takes priority automatically. Hotel evenings cost nothing.
How much do maps really use per week?
Two or three hours of daily navigation: roughly 100 MB a week. With offline maps: a fraction of that. Never pick a plan size because of maps.
Size it and go
Pick your profile, add a size for safety, and grab the plan. Typical answer for a two-week trip: 10 GB, and at these prices that's a coffee. Related: eSIM vs roaming costs · installation guide.