Most travelers have a mental model of data usage that's slightly off. They worry about navigation. They think twice before opening Maps. And then they quietly burn through a gigabyte watching Instagram Reels for 20 minutes at the airport.
Understanding which apps are heavy data consumers and which are lean is the single most useful thing you can do before buying a travel eSIM plan. Here's a clear-eyed look at the real data costs of the apps you actually use while traveling.
The Heaviest Offenders: Video-First Apps
Anything that plays video is, by definition, pulling large amounts of data. This sounds obvious, but the sneaky part is how many apps now play video without you choosing to watch anything.
TikTok
TikTok is almost certainly the most data-hungry app most travelers have on their phone. The entire feed is full-screen, auto-playing video — there's no way to use TikTok passively. Estimates vary by video quality and connection speed, but active TikTok use typically consumes 300–700 MB per hour. Half an hour per day across a 10-day trip can easily add up to 1.5–3.5 GB.
TikTok does offer a "Data Saver" mode in its settings that reduces video quality and bitrate. It's worth enabling before you leave — the videos still play, they just look slightly less sharp.
YouTube
YouTube at standard definition (360p–480p) uses roughly 200–400 MB per hour. At HD (720p), expect 500–750 MB per hour. At 1080p, closer to 1–1.5 GB per hour. The YouTube app defaults to "Auto" quality, which means it'll stream at whatever quality your connection supports — and on a fast LTE or 5G connection abroad, that often means HD without you asking for it.
Change your YouTube quality setting to a fixed 360p or 480p in the app settings before traveling. You can also download videos to watch offline while on WiFi.
Netflix, Disney+, and Streaming Services
Streaming a full movie in SD quality uses 300–500 MB per hour. HD quality: 1–1.5 GB per hour. A 2-hour HD movie = 2–3 GB. If you plan to watch anything on a long flight, train journey, or evening in a hotel with poor WiFi, download the content to your device before you leave. Every major streaming platform now offers offline downloads.
Instagram is more nuanced than TikTok because it mixes photos and video. Browsing a photo-heavy feed is lighter — around 50–100 MB per hour. But once you're watching Reels or Stories, you're effectively watching video, and the numbers jump to 200–500 MB per hour of active scrolling. Instagram also auto-plays Reels in the feed, so even if you're just browsing past them, data is being consumed.
Instagram has a "Data Saver" option in Settings → Account → Cellular Data Use. Turning this on prevents videos from preloading and reduces background data consumption considerably.
Video Calls: More Than You Might Expect
A lot of travelers don't think of video calls as "streaming," but they are — live, two-way video streaming, which means data flows in both directions simultaneously.
WhatsApp Video Calls
WhatsApp video calls use roughly 200–300 MB per hour at typical quality. A 30-minute call home: 100–150 MB. Daily 30-minute calls across a 7-day trip: approximately 700 MB–1 GB. That's a meaningful chunk of a 3 GB plan used entirely on staying in touch with people back home.
WhatsApp audio calls are significantly cheaper — around 30–50 MB per hour. If you're watching your data, switching from video to audio for check-in calls can save you hundreds of megabytes per day.
FaceTime and Zoom
FaceTime audio is one of the most data-efficient ways to make a call — around 20–40 MB per hour. FaceTime video runs 400–600 MB per hour depending on connection quality.
Zoom on a stable connection uses 500–800 MB per hour for a one-on-one video call, more if you're in a group call with multiple video feeds. For travelers who need to join work calls on the road, a single hour-long Zoom call can consume a significant portion of a smaller data plan.
Music and Audio: Light, but Cumulative
Spotify
Spotify at "Normal" quality (96 kbps) uses about 40–50 MB per hour. At "High" quality (160 kbps): 70–80 MB per hour. At "Very High" (320 kbps): 144 MB per hour. For most casual listening, normal or high quality is perfectly fine and meaningfully lighter than the top setting.
Three hours of Spotify daily at normal quality across a 7-day trip: roughly 840 MB–1 GB. Manageable within most plans, but worth noting. The smarter approach is to download your playlists, podcasts, and albums while on WiFi before you travel. Spotify, Apple Music, and most major audio platforms support offline listening.
Podcasts
Podcast audio is typically compressed and lightweight — around 20–40 MB per hour. A 60-minute podcast episode streamed over mobile data might use 25–50 MB. This is genuinely one of the more data-efficient ways to pass time, though downloading episodes before travel is still the smarter move.
Navigation: The App Everyone Worries About (But Shouldn't)
Google Maps
Google Maps uses data to load map tiles and routing information, but it caches aggressively. Once you've been in an area and the map tiles are loaded, navigating through that area again costs almost nothing. Fresh routing and map tile loading uses roughly 0.5–2 MB per request.
A full day of active city navigation — looking up directions, searching for restaurants, viewing transit options — typically uses between 30–80 MB total. Even heavy map users who are constantly searching and re-routing rarely exceed 100 MB per day.
You can reduce this further by downloading offline maps for your destination before you travel. Google Maps lets you download entire cities or regions for offline use, which covers navigation even when you have no data signal at all.
Apple Maps
Similar to Google Maps. Offline maps have historically been less comprehensive, but Apple Maps has improved significantly and now supports offline map downloads in most major markets.
Waze
Waze stays connected to a live data feed for traffic and incident reporting, which makes it slightly more data-hungry than standard Maps. Still modest — typically 30–100 MB per day of active use.
Download offline maps before you land. It reduces your navigation data use to near-zero and keeps you connected even in areas with no signal. Google Maps offline is available for entire countries and cities.
Messaging Apps: Almost Nothing
WhatsApp (text and voice messages)
WhatsApp text messaging is negligible — thousands of messages use barely a few megabytes. Voice notes are slightly larger but still minimal. Sharing photos over WhatsApp compresses the images before sending, keeping file sizes small. Sharing videos uses more, but WhatsApp also applies compression to those.
Unless you're making video calls or sending uncompressed media files, WhatsApp will barely register in your data usage.
iMessage and SMS
Text-based iMessages use almost nothing. Where iMessage gets data-heavy is when someone sends you large video clips, Live Photos, or original-quality media. These download automatically in most cases — you can configure iMessage to "Load Later" for large attachments if you're watching your data carefully.
Telegram
Telegram can be surprisingly data-hungry if you're in active group chats that share media files. The app also auto-downloads media by default, which can accumulate. Check Telegram's settings (Settings → Data and Storage) and disable automatic media downloads over mobile data.
Travel-Specific Apps: Generally Lean
The apps designed specifically for travelers are mostly optimized to be data-light, because they were built knowing that data connectivity abroad is expensive and unreliable.
- Uber / Bolt / Grab: A few MB per booking. These apps are remarkably lean.
- Google Translate: Text translation uses almost nothing. Camera translation (pointing your camera at a sign) fetches more data for image processing, but still very modest — maybe 1–5 MB per session.
- Booking.com / Airbnb: Image-heavy but used infrequently. A browsing session: 10–50 MB. Not a meaningful drain if you're using it for a few searches.
- TripAdvisor / Google Maps restaurant search: Mostly loading images, very low frequency. A few MB per search session.
- Currency converters and travel calculators: Essentially zero. These fetch tiny amounts of exchange rate data.
The Invisible Drain: Background Data
Apps don't only use data when you're actively looking at them. In the background, your phone is constantly syncing photos to iCloud or Google Photos, refreshing email, checking for notifications, updating app content, and running system processes — all without any visible indication.
On a day when you think you barely used your phone, your background data could still account for 100–300 MB of consumption. The main culprits are usually cloud photo sync, email with large attachments, and app content refreshes.
Disabling background app refresh for non-essential apps is one of the highest-value adjustments you can make before a trip. Our guide on saving mobile data abroad covers exactly which settings to change and how.
iCloud Photo Library and Google Photos are set to sync over mobile data by default on many phones. If you take a lot of photos while traveling, this background sync can consume several gigabytes over a week without you ever noticing. Set both to WiFi-only sync before you leave.
App-by-App Summary
To give you a quick mental model:
Very heavy (1+ GB/hour when active): Netflix HD, YouTube HD, live sports streaming.
Heavy (300–700 MB/hour): TikTok, YouTube SD, Netflix SD, Instagram Reels browsing, Zoom/video calls.
Moderate (100–300 MB/hour): WhatsApp video calls, Instagram general browsing, Facebook video feed, Spotify on high quality settings.
Light (under 100 MB/hour active use): Google Maps navigation, Spotify standard quality, Twitter/X text browsing, WhatsApp messaging, web browsing.
Negligible (single-digit MB per session): WhatsApp text/voice messages, Uber/ride-hailing bookings, currency apps, translation text queries.
When choosing a travel data plan, the most important question to ask yourself is whether you'll be using any of the "heavy" category apps on mobile data. If video is part of your daily travel routine, plan accordingly. If your trip is mainly navigation, messaging, and light browsing, you need much less than you might think.
Use this breakdown together with our one-week data usage estimator to land on a plan size with confidence, then browse available eSIM plans to find the right option for your destination.