
Why most eSIM comparisons are not usable
A comparison table for China eSIMs usually contains three things that cannot be trusted on the day you read them: a price, a maximum speed, and a coverage claim. Prices move with promotions and exchange rates, “up to” speeds describe a network’s theoretical ceiling rather than what you will see standing in a museum, and coverage statements written by a reseller describe the host network, not the routing agreement behind the product. None of that means comparison is impossible – it means the useful comparison is about questions, not numbers.
What follows is the checklist we would use ourselves, and the reason each item earns its place.
The five questions that separate real differences
1. Which network does the traffic actually ride on?
An eSIM sold in Europe can terminate on any of the Chinese carriers, directly or through an agreement. That single fact drives performance in smaller cities, tunnels and rural scenic areas. Ask which operator carries the data, then judge that operator’s own coverage statement for the places you will be – not a generic “nationwide” badge.
2. Is the plan limited by days, by data, or by both?
A duration label and an allowance label answer different questions. Some products stop working when the days run out even if data remains; others stop when the data runs out even inside the validity window. Whichever it is, find out which one expires first for the way you actually use a phone: maps on, translation open, hotspot occasionally on.
3. Can you top up, and how?
Running dry on day four of a seven-day plan is the most common complaint. A product with a clear in-app top-up path behaves very differently from one where the only option is buying a second plan. Ask before you buy, and read what happens to the remainder if you top up early.
4. Does it include a local number, and do you need one?
Most travel eSIMs are data-only. That is fine for maps, translation and messaging. It becomes a problem if a service you rely on sends a verification code by SMS, or if you want to call a hotel or a driver directly. Decide whether a local number matters for your trip before choosing between an eSIM and a physical SIM.
5. What support exists while you are in China?
Ask the awkward question: if it fails on day two in a city where you do not speak the language, what is the path to help, and in what language and hours? A provider that answers this concretely is usually the one that has thought about it.
What “unlimited” and “5G” are actually telling you
Two labels deserve particular scepticism. “Unlimited” almost always carries a fair-use threshold after which speeds change; the number and the behaviour afterwards matter more than the word. “5G” describes a capability of the host network, not a guarantee at your location – a plan can be 5G-capable and fall back to older generations in a basement gallery or a mountain valley, which is normal and not a defect. Ask what the product does in those places, and treat any answer that promises constant speed as marketing.
A ten-minute test you can run before you fly
Buy the shortest option that fits your dates, install it at home on the same Wi-Fi you will rely on for the first login, and then check four things: the profile installed cleanly, mobile data is allowed for that line, a map search works with Wi-Fi switched off, and the hotspot behaves as you expect if you plan to use it. Record what you see. This costs ten minutes and replaces a table of unverifiable numbers with your own measurement on your own device.
If you are arriving under a visa-free transit window, run that test against the real constraint – how long you have between planes, not how fast the download looks at home. The 240-hour visa-free transit checklist covers what you can realistically reach in a stopover, and the high-speed rail guide covers the airport-to-city leg where a working map stops being optional.
Where our own plan fits
We sell travel eSIMs for China through our travel eSIM page, which lists what each current option includes – validity, allowance, whether a local number is part of it, and the price that applies today. We deliberately do not publish third-party prices or speed figures in this article: they change, and a stale number in a buying guide is worse than no number.
Frequently asked questions
Should I buy an eSIM before arriving in China or at the airport?
Before, if your device supports it. The advantage is not price but certainty: you install on familiar Wi-Fi, test that it works, and step off the plane with a map already usable. Buying on arrival is still a valid choice when your phone cannot take a second profile, or when you want a local number from the first day.
Do eSIM data plans include phone calls and SMS?
Usually not. Most travel eSIMs are data-only, so voice and SMS to local services are not part of the product. If a service you depend on sends codes by text, plan for that separately rather than discovering it at an arrival hall.
Will an eSIM work on a train between cities?
It works wherever the host network does, which on a high-speed line means fast handovers between cells and genuinely variable speed in tunnels and cuttings. Expect usable but uneven connectivity on rail journeys, and download what you need before boarding.
Can I keep my home SIM active at the same time?
Generally yes, if the phone supports dual lines: keep the home line for calls and verification codes, and use the Chinese data plan for everything that needs local traffic. Confirm eSIM support for your exact model rather than the product family.
Plan the trip around the constraint that actually bites: build your route in the trip planner, then match the plan length to the days you will really need data.

