How much mobile data should I budget for a two- or three-week China trip?

At a glance

• iPhone Settings → Cellular/Mobile Data shows usage by app and permits individual apps to be disabled for cellular data. [1]
• Apple provides Reset Statistics to begin a fresh measurement period; the carrier remains the source for billing-period totals. [1]
• A worked 20-day budget is 10GB at 0.5GB/day,20GB at 1GB/day or 40GB at 2GB/day, before any chosen buffer. Use your measured pattern to choose the scenario.
• Apple's Personal Hotspot shares the selected cellular connection with other devices, so laptop use belongs in the same data budget. [2]
• Airalo's Asia page separates fixed-data and unlimited package options and provides package-specific validity and renewal settings; inspect the product's details before comparing price. [3]

What to do next

1. Before buying, measure a few representative days using the phone's cellular statistics and your carrier account. Note whether home Wi-Fi has hidden the activities you will do on mobile data while travelling, especially video calls, uploads and navigation.
2. Separate essential use from heavy optional use. List maps, messages, bookings and translation, then add streaming, social-video browsing, cloud-photo upload and laptop hotspot needs rather than giving every traveller the same daily allowance.
3. Multiply the measured daily use by the travel days and add a buffer you are comfortable paying for. For example,20 days at 1GB/day plus a 25% buffer gives 25GB; change the assumptions when you expect several long work or video days.
4. Compare the package's included data, validity start, coverage, top-up availability and any fair-use or hotspot restriction. Read what happens after the allowance is used or a daily limit is reached before choosing an unlimited label.
5. Download useful maps and other supported offline material on a reliable connection. Set optional backups and large downloads to a suitable Wi-Fi arrangement and disable unnecessary cellular use for apps that would consume the budget in the background.
6. Check usage after the first two or three travel days and adjust while a supported top-up is easy. Keep enough data for the final airport transfer and departure documents instead of using the entire allowance early in the trip.

If your situation is different

You work from a laptop: include meetings, file synchronisation, software updates and hotspot traffic. Compare the actual work applications and employer requirements with the provider's hotspot policy before relying on a phone plan.

You mainly use maps and messages: measure that pattern and choose a smaller package with a usable top-up route when it offers better value. Keep video and background uploads from silently changing the assumption.

You upload many photos or videos: budget for the files you intend to send and the available Wi-Fi periods. A sightseeing day can have low browsing use but a large evening upload.

The package says unlimited: inspect speed reduction, daily high-speed allowance, tethering and renewal terms. Decide whether the post-limit service still supports the tasks that matter to you.

Common mistakes

• Estimating from days mostly spent on home Wi-Fi: include activities that will move to cellular data.
• Forgetting laptop hotspot usage: count every connected device.
• Buying on the unlimited label alone: inspect fair-use and hotspot conditions.
• Waiting until data is exhausted to find the top-up route: save it before travelling.

Quick questions