Should I choose a travel eSIM, roaming or a local Chinese SIM?

At a glance

• On an iPhone, check Settings → General → About → Carrier Lock; No SIM Restrictions means the phone is unlocked for another carrier. [1]
• To select the data line, Apple gives Settings → Cellular → Cellular Data. [1]
• Apple distinguishes international roaming, a travel eSIM and a local carrier plan; keeping the home line active can still incur home-carrier roaming fees. [1]
• UK travel advice notes restrictions affecting services including Google, Facebook, YouTube and X; match the connection to the actual apps you need. [2]

What to do next

1. Write down the jobs your connection must do: maps and messages, bank SMS, calling a hotel, receiving a driver’s call, video uploads or laptop work. Separate mobile data from having a mainland telephone number.
2. Check the exact phone model, carrier lock and SIM capability before buying. For an iPhone, use the Carrier Lock path above. If the device has no usable eSIM support, choose a physical travel SIM or an appropriate home-carrier roaming package instead.
3. Compare plans for mainland coverage, data allowance, validity, hotspot use and activation timing. For a trip also visiting Hong Kong or another country, inspect the actual region list rather than assuming one China-labelled plan covers every stop.
4. Decide what happens to your home number. Keep it active if you need its bank or login messages, and ask the carrier about inbound SMS, calls and roaming charges. Select the intended travel line for data instead of leaving the choice ambiguous.
5. Install and save the provider’s setup instructions before departure. Note what starts the paid validity period and where to find support. Keep the original plan and activation information available outside the app in case you need it after arrival.
6. After landing, follow that provider’s activation and data-roaming instructions, select the correct data line and test the services you need. If laptop meetings are essential, test the hotspot and a short call before relying on the connection for a scheduled meeting.

If your situation is different

You need a mainland number: buy a plan that explicitly includes it. Ask the carrier about voice, SMS and the documents required to activate the line. A data package alone will not solve a service that insists on receiving a call or text at a local number.

Your existing carrier includes China roaming: compare its data allowance, speed conditions and charges before buying another plan. Keep the home route if it does the job at an acceptable cost and you understand which services it provides.

You need specific overseas apps for work: ask the plan provider about those named services and its mainland routing, then test them on arrival. Keep a second connection and a workable contingency for the first important meeting.

You use a local carrier connection: plan around the websites and services available on that route. Download useful local apps beforehand and keep important addresses, reservations and files offline.

Common mistakes

• Buying by the eSIM label alone: compare coverage, activation, data allowance, hotspot terms and whether the plan includes a phone number.
• Deleting the home line before bank verification is finished: keep access to the number your accounts actually use.
• Leaving the wrong line selected for data: choose it explicitly and follow each carrier’s roaming settings.
• Assuming a working map proves the laptop setup is ready: test the actual meeting service and hotspot before the meeting.

Quick questions