How much eSIM data do you actually need abroad?

Most people overbuy travel data because they picture a worst case that never happens. In practice, a day of maps, messaging and a few photos rarely tops half a gigabyte, while a day of video streaming and using your phone as a hotspot can pass two gigabytes without trying. A useful starting point: budget around 0.3 to 0.5 GB per day if you travel light, 0.7 to 1 GB if you use your phone normally, and roughly 2 GB per day if you stream or tether a lot. Multiply that by the number of days you will be away, round up one plan size, and you have a sensible figure. The rest of this guide shows where the gigabytes actually go, so you can size yours with confidence.

Start with how you travel, not a headline number

There is no single right amount, because two people on the same trip can use wildly different data. The honest way to size a plan is to think about what you actually do on your phone for a few hours each day abroad, then add a small buffer. If you mostly navigate, message and check a few things, you need far less than the big plans suggest. If your phone is your camera, cinema and office rolled into one, you need more. Everything below is approximate and rounded, and real figures shift with video quality, signal and app settings, but the ranges are close enough to plan around.

Maps, messaging and browsing: the light stuff

These are the everyday tasks that feel constant but sip data. Turn-by-turn navigation uses roughly up to 60 MB an hour when it keeps reloading the map, and almost nothing if you download the area offline before you set off. Messaging is tiny: a whole day of WhatsApp or iMessage text, including the odd photo, is only a few megabytes. Email and general web browsing run a few megabytes per page. A full day of just these will often stay under 300 MB, which is why light travellers get by on very little.

Social media and short video: the sneaky one

This is where budgets quietly blow out. Scrolling Instagram, TikTok, Facebook or X plays video almost constantly, so half an hour can use around 250 to 350 MB, and an autoplay habit across a full day adds up fast. Posting is lighter than watching. If you want to keep this in check, set these apps to use less data or standard quality in their settings, and save the high-resolution uploads for wifi. It is the difference between social costing you a couple of hundred megabytes a day and a couple of gigabytes.

Streaming video and music

Full video streaming is the heaviest common activity. An hour of standard-definition video is roughly 0.7 GB, HD can be about 1.5 GB or more per hour, and 4K climbs to several gigabytes, so a single film abroad can eat a large plan on its own. Music streaming is far lighter, around 60 to 150 MB an hour depending on quality, and podcasts lighter still. If you want a series for a long journey, download the episodes and playlists over wifi before you leave, and streaming stops being a data problem at all.

Video calls and using your phone as a hotspot

Video calling is moderate to heavy: a 30-minute WhatsApp or FaceTime video call is roughly 300 to 400 MB, so plan for around 700 MB an hour of face-to-face calls. The real multiplier is tethering. The moment you share your phone's connection with a laptop or tablet, that device's full internet, including background updates and cloud sync, runs through your travel plan. Hotspot is genuinely useful, just size for it: a working day tethered can easily pass 2 to 3 GB.

Light, typical and heavy days

Putting it together into daily tiers makes planning simple. A light day, mostly maps, messaging and a little browsing, lands around 0.3 to 0.5 GB. A typical day, adding social scrolling, photos and the odd short video, sits near 0.7 to 1 GB. A heavy day, with streaming, long video calls or regular hotspot use, runs roughly 2 GB and up. Decide honestly which one describes you, then multiply by your trip length. A five-day typical trip is about 4 to 5 GB, which tells you the plan size to look for.

How wifi stretches every plan

Hotel, cafe and apartment wifi does much of the heavy lifting on a trip, and using it on purpose shrinks the plan you need to buy. Do the data-hungry jobs on wifi: download offline maps and shows, back up photos, run app and phone updates, and make long video calls. Then let your eSIM cover you while you are out and about, where you mainly need maps and messaging. Travellers who lean on evening wifi often use half what they expected on cellular, so you can comfortably size down a tier.

A worked example

Say you are away for seven days and use your phone normally: maps around town, plenty of messaging, social scrolling, photos, and a couple of short video calls, with hotel wifi each night. That is a typical profile at roughly 0.8 GB a day, so about 5.6 GB across the week. Round up to the nearest plan, perhaps a 7 or 10 GB option, and you have a small buffer for a heavier day without paying for a huge allowance you will never touch. A lighter traveller on the same trip might need only 3 GB, while a committed streamer could want 15 GB or more.

Build in a small buffer, then top up rather than overbuy

Add a little headroom, not a lot. One bad-signal day where apps keep retrying, or one evening of streaming, can nudge you over a tight estimate, so rounding up one size is sensible. Going far bigger is not, because you rarely use it. The safer approach is to buy a realistic plan and top up if you run low, which on Simzora takes a couple of taps and starts straight away. That way you are never stranded, and never paying for gigabytes you leave behind.

How the plan itself works

A travel eSIM is data-only, so it carries your internet and nothing else. Keep your home SIM in the phone and active for calls and texts, which is how bank OTP codes and two-factor messages still reach you, and let the eSIM handle data. Install it at home on wifi before you fly, since setup is just downloading a profile, and it will not start counting until it first connects to a network at your destination. So buying a few days early costs you no data, and you land already online.

The bottom line

Size the plan to how you actually use your phone, not to a fear of running out. Budget roughly 0.3 to 0.5 GB a day for light use, 0.7 to 1 GB for typical use, and around 2 GB for heavy use, then multiply by your days, lean on wifi for the big downloads, and round up one size. Keep your home SIM for calls and codes, install the data-only eSIM before you travel, and let it start when you arrive. Do that and you will almost always land with the right amount, plus the freedom to top up in seconds if you do not.