“How much data do I need?” is the question behind every plan choice — and the one most people guess at. Guess too high and you pay for gigabytes you never touch; guess too low and you’re throttled or topping up. Here’s how to get a realistic number for both home and travel, so your plan fits like it should.
Find your real number first
The fastest way to know your usage is to look at it. On iPhone, go to Settings → Mobile Service and scroll to your statistics; on Android, Settings → Network & Internet → Data usage. Check the last few months and you’ll see a pattern. That single figure beats any estimate, and it’s the perfect starting point for choosing from our mobile plans.
What typical activities cost in data
Rough guides for an hour of common activities:
- Messaging and browsing: very light — tens of megabytes.
- Social media scrolling: around 100–300 MB, more with autoplay video.
- Music streaming: roughly 60–150 MB depending on quality.
- Standard-definition video: around 0.5–1 GB.
- HD video streaming: 1.5–3 GB or more.
- Video calls: roughly 0.5–1.5 GB.
Add up the activities you do regularly on mobile data (not Wi-Fi) and you’ll get a monthly ballpark.
Match the number to a plan size
As a rough framework:
- Under ~3 GB/month: a light plan. You’re mostly on Wi-Fi and use data for maps and messaging.
- ~3–15 GB/month: a mid plan. Regular social media, music and some video on the go.
- 15 GB+ or unlimited: a heavy plan. You stream video on mobile data or tether a laptop.
If you’re right on a boundary, a no-contract plan lets you size up or down next month without penalty — so you can start close and fine-tune.
The Wi-Fi factor
Your mobile data need is only the part Wi-Fi doesn’t cover. If you’re on home and office Wi-Fi most of the day, even heavy streamers can sit on a modest mobile plan. If you’re often out and about with no Wi-Fi, your mobile figure climbs. Be honest about your week — a commuter who streams on the train needs more than someone who’s desk-bound near Wi-Fi all day.
How much data for travel?
Travel changes the maths because you’re usually on data all day. A practical guide:
- Light traveller (maps, messaging, occasional photo upload): ~500 MB–1 GB per day.
- Average traveller (the above plus social media and some video): ~1–2 GB per day.
- Heavy traveller (streaming, tethering, lots of uploads): 2 GB+ per day.
For short trips, a daily-allowance travel eSIM is ideal; for longer stays, a larger fixed bundle works out better. A week in Spain at a gigabyte a day is easy to budget for, while a month across Asia calls for a bigger plan. Globetrotters doing several countries can keep one Global eSIM running throughout.
Easy ways to use less
If you’d rather buy a smaller plan and stretch it:
- Download offline maps and playlists before you head out.
- Set streaming apps to standard quality on mobile data.
- Turn off autoplay video in social apps.
- Back up photos only on Wi-Fi.
These habits can roughly halve everyday usage without you noticing.
The bottom line
Don’t guess — check your phone’s stats, match the number to a plan size, and remember that Wi-Fi does a lot of the heavy lifting at home. For travel, think in gigabytes per day and pick a plan to suit the trip length. With a flexible, no-contract approach you can always adjust later. See the options on our plans page, browse Europe and other travel eSIMs for your next trip, and learn more at Extrafon.