China eSIM with a Singapore IP for travellers | UncleSim
UncleSim's China travel eSIM gives you mobile data in mainland China with a Singapore network exit, so the apps you already use at home keep working while you travel. You install it before you fly, switch the line on when you land, and the phone connects automatically to China Unicom 5G/4G nationwide. Plans run from 3 to 30 days, each with 2GB of high-speed data every day and unlimited data at 5Mbps after that.
What is a China eSIM with a Singapore IP?
A China eSIM is a travel data plan that lives inside your phone as a digital SIM, with no plastic card to swap and no shop to visit. The Singapore IP part describes the route your data takes. The SIM roams on China Unicom inside mainland China, and the traffic is handed to the internet through a Singapore network exit. Because that exit sits in Singapore, the sites and services you normally open at home behave normally on the trip. Your phone still shows a China network in the status bar, and your data still works in every province you visit.
It is a single plan for one trip, not a subscription. Nothing about your normal SIM changes: your own number keeps working for calls and messages while the eSIM carries the data.
Which apps keep working when your data is routed through Singapore?
In practice, the everyday ones: Google Search and Maps, Gmail, YouTube, ChatGPT, WhatsApp, Instagram and the other services you use at home. If a service works for you in Hong Kong, Europe or the United States, it works the same way on this plan. That is the entire point of the Singapore exit, and it is why people going to China for business pick it over a domestic-only data plan.
Two practical notes. First, apps that need your location still read the phone's GPS, which knows where you really are, so maps and ride-hailing behave correctly. Second, anything you sign into at the start of the trip keeps working for the length of the plan, because the line stays active on the phone.
Which network does the eSIM use in mainland China?
It connects automatically to China Unicom's 5G/4G network, nationwide. You do not choose a carrier or type in access point settings: turn the line on and the phone attaches to the network by itself. Coverage follows China Unicom's own footprint, which reaches the major cities, the high-speed rail corridors and the main tourist regions.
If you land and the phone shows no bars, the usual cause is the line still being switched off in settings, or the data line still pointing at your home SIM. Both take a few seconds to fix, and the no internet help page walks through the checks in order.
How much data do I get each day?
Every day of the plan gives you 2GB at full speed on 4G/5G. When that is used, the plan keeps working at 5Mbps with no daily cut-off, which covers maps, messaging, email and music, and is workable for video at a lower quality. The allowance resets with each new day of the plan. The store explains how speed, fair usage and hotspot behave on the speed and hotspot page.
How long are the plans, and which length should I pick?
Plans run from 3 days to 30 days. Match the length to the trip: 3 to 7 days for a short visit, 10 to 15 days for a two-week itinerary, and 30 days when you are in and out of the country across a month. The whole shelf sits in the China eSIM collection, and every destination we cover is on the plans page.
How do I install the eSIM before I fly?
Buy the plan and the eSIM arrives as a QR code by email. Install it while you still have a reliable connection, at home or at the airport, and leave the line switched off until you land. The step-by-step walkthrough is in the install guide. If the code will not scan, the QR code help page covers the usual causes, from screen brightness to printing the code on paper.
Is my phone eSIM-ready, and when does the plan start?
Most phones sold since 2018 support eSIM, and the check takes a minute: open your mobile settings and look for an option to add an eSIM or add a cellular plan. The device compatibility page lists the models we see most often. Plan validity starts when the eSIM first connects to a network in the destination, not on the day you buy it, so installing a week early costs you nothing. That rule is set out on the plan validity page.
Should I keep my own SIM in the phone?
Yes. Keep your normal SIM for calls and messages and run the travel eSIM alongside it. In settings you choose which line carries data, so your Hong Kong or home number still receives verification codes and calls while the trip plan handles the internet. Nothing about your own SIM changes, and when the trip ends you simply remove the travel plan from the phone.
What should I check before I fly?
Three things, in this order. Confirm the phone is eSIM-ready, install the plan while you have a good connection, and note how long you are staying so the plan length matches the trip. Travellers who do those three things in advance land with working data and no queue at the airport counter.
For a longer trip, work out the total days first and buy one plan that covers them rather than topping up twice. For a short business trip, the 3-day and 7-day options are usually the right size. When you are ready, pick the length on the China roaming with a Singapore IP plan, or browse the full eSIM range if the itinerary crosses more than one region.
Common questions
What if I use two phones on the trip? Install the plan on the phone that needs the data and use personal hotspot for the second device; how hotspot behaves on this plan is described on the speed and hotspot page. What if I run out of days mid-trip? Buy a second plan for the remaining days and install it the same way. Where do I get help if something looks wrong? The help centre collects every guide in one place, and support is reachable from there.
Everything in this guide describes the China roaming plan that routes through a Singapore exit. Read the plan page for what is included on each trip length, install before you fly, and switch the line on when you land.