China Unicom eSIM — coverage, plans & network
Mainland China
Key highlights
- Founded in 1994; one of China's three nationwide state-owned carriers
- ~340 million mobile subscribers in mainland China
- Shares a jointly built 5G radio network with China Telecom — among the world's largest
- Historically the most compatible Chinese network for phones bought abroad
- Mainland SIMs require real-name passport registration — a travel eSIM installs before arrival instead
About the operator
China Unicom is one of China's three nationwide mobile carriers, serving around 340 million subscribers on 4G and one of the world's largest 5G networks. Founded in 1994 and headquartered in Beijing, the state-owned operator was created to bring competition to China's telecom market.
China Unicom operates alongside China Mobile and China Telecom, and co-built a shared 5G radio network with China Telecom — one of the largest such deployments anywhere, with over a million 5G base stations between the two partners — giving it dense 5G in cities, metro systems and along high-speed rail corridors. It has also long been the most international-phone-friendly of the Chinese carriers, since its 3G/4G bands aligned best with handsets sold abroad.
For visitors, the practical points matter more than the corporate ones: local SIMs in mainland China require in-person real-name registration with a passport, and phone eSIMs from domestic carriers only began appearing in late 2025, with the same in-store rules. AviaeSIM's prepaid China travel eSIMs connect to the China Unicom network, install by QR code before you travel, and route data internationally — so the apps and services you use at home generally keep working the way they do when roaming.
- Founded
- 1994
- Headquarters
- China
- Network
- 4G, 5G
- Subscribers
- ~340M mobile subscribers
Network & technology
China Unicom's 4G LTE covers essentially all cities, towns and transport corridors in mainland China, and its 5G — co-built and shared with China Telecom — is dense in urban areas, metro systems and along high-speed rail lines. Its long-standing use of globally common WCDMA/LTE bands makes it the network most foreign phones connect to most easily. Legacy 2G/3G service is being retired, so a modern 4G/5G handset is assumed, and coverage in remote rural and mountain areas can trail market leader China Mobile.
Reputation & market position
China Unicom is the smallest of China's three state carriers by mobile subscribers but is well regarded for value pricing and, among travelers and expats, for being the easiest network to use with an international phone. A Fortune Global 500 company, it has focused recent investment on 5G sharing with China Telecom and enterprise services, and its urban network quality is considered on par with its larger rivals.
Pros
- Dense 4G/5G in cities, metro systems and along high-speed rail
- Best historical band compatibility with phones bought outside China
- Value-oriented pricing among China's big three carriers
- With an AviaeSIM travel plan: data works on arrival, no in-store registration
Cons
- Smallest of China's three carriers, and rural coverage can trail China Mobile
- Local SIM or eSIM purchase requires in-person real-name passport registration
- On locally issued SIMs, data uses mainland routing, where some international apps and services are unavailable
Available plans
Countries covered
Get your China eSIM from AviaeSIM — instant QR activation, no roaming fees.
How to activate
- 1Choose your destination and a plan on the China Unicom network
- 2Pay and receive your eSIM QR code by email
- 3Scan the QR code in your phone's settings to install it
- 4Turn on data roaming for the eSIM when you arrive
Frequently asked questions
Does China Unicom support eSIM?
For years, mainland Chinese carriers offered eSIM only for watches and other wearables. Phone eSIM support began rolling out in late 2025, with China Unicom among the first approved — but it still requires in-person real-name registration with ID or passport at a store. For a trip, a prepaid AviaeSIM China travel eSIM on the China Unicom network installs by QR code before you leave home.
What are China Unicom's tariffs for travelers?
China Unicom sells local prepaid plans priced by data volume and validity, but buying one as a foreign visitor means an in-person passport registration at an official store, usually in Chinese. AviaeSIM's China travel plans on the China Unicom network are prepaid packages sorted by data amount and duration — current options are on the China plans page, and no registration is needed.
Will my usual apps work on a China Unicom travel eSIM?
AviaeSIM's China plans route data through international gateways, the same way roaming does, so the apps and services you use at home generally keep working as usual, with no extra setup. A local mainland SIM behaves differently: its data uses mainland routing, where some international services are not available. That difference is worth knowing when choosing between a local SIM and a travel eSIM.
Do I need to register a SIM card in China?
For local SIMs, yes — mainland China requires real-name registration, so a carrier store will record your passport before activating a line. A prepaid travel eSIM bought before your trip is provisioned outside mainland China, so there is no in-store registration: you install the QR code at home, enable data roaming on landing, and it connects to the China Unicom network.
Useful links
Other operators
Information updated: 2026-07