Arrive with one connection that should work, then add a local option only if it improves cost or reliability. No single solution fits every phone, passport, provider or app.
Three common choices
- International roaming: easiest for keeping your number and receiving bank messages, but potentially expensive.
- Travel eSIM: convenient on compatible unlocked devices; routing, voice service and app availability depend on the provider.
- Local SIM: Chinese government guidance says foreigners can take passports to service offices of China Telecom, China Mobile or China Unicom to activate mobile service. Plans and English support vary.
Before you buy
Confirm that the phone is unlocked, supports the relevant bands and can use dual SIM or eSIM as expected. Ask whether the plan includes a Chinese number, voice calls, hotspot use and enough high-speed data. Keep the original SIM secure and know which line receives banking messages.
Real-name registration and security
A local SIM requires identity registration. Use an official operator service outlet or clearly authorised channel and do not hand your passport to an unverified street seller. Protect one-time codes, set a device lock and remove sensitive screenshots from the photo roll.
Internet and overseas apps
Availability varies with connection type, provider and current Chinese network regulation. Kakagogo explains lawful connectivity choices but does not sell, configure or guarantee tools intended to bypass network controls. Download essential documents, translation resources and hotel details offline before departure.
Once data works, configure only the essential apps you need and test payments on a small purchase.
Choose the connection by function, not by marketing label
A visitor needs data for payment, maps, translation and messages, but may also need ordinary voice calling and access to bank security messages. International roaming, a travel eSIM and a Chinese local SIM solve different combinations of those needs. Write down which number must receive bank codes, whether a local number is needed and how much data the itinerary will use before comparing plans.
International roaming is often the simplest arrival layer because it preserves the existing number, but it can be expensive. A travel eSIM can provide convenient data on a compatible unlocked phone, yet may not provide a Chinese number or local voice calls. A local SIM can add local service and cost efficiency but requires passport-based identity registration at an operator channel.
Check the phone before buying anything
Confirm that the handset is unlocked, supports the necessary bands and can use the intended eSIM or dual-SIM arrangement. Some devices sold in particular markets have different SIM hardware or software. Check the exact model number, not only the phone family. Back up the device, install current security updates and know how to switch the data line without disabling the line needed for authentication.
If using two lines, label them clearly and turn off unintended data roaming. Decide which line handles mobile data, calls and messages. A phone can silently use an expensive home-country data plan after a signal change if the settings are not reviewed. Take screenshots of the correct configuration while connected to reliable Wi-Fi, but exclude passwords and QR activation codes.
International roaming as an arrival safety net
Ask the home operator whether China is included, whether the pass starts automatically, how high-speed data is measured and whether ordinary local calls are supported. Understand what happens after the allowance is used: reduced speed, a new charge or complete loss of data. Keep the operator support channel available offline.
Roaming is especially useful for receiving card-issuer messages, but delivery of every SMS is not guaranteed. Test important banking authentication before departure and add an app-based method where the bank supports it. Do not rely on a single number for the only payment card and the only travel account.
Travel eSIM questions that matter
Check whether the plan is data-only, when validity begins, which mainland network it uses, whether hotspot sharing is allowed and what “unlimited” means after any fair-use threshold. Read the refund rule before scanning the activation code because installation can make a plan non-refundable. Save the code securely and do not post it in a support forum.
Routing and overseas-app availability depend on provider design and current network conditions. A past traveller’s experience does not guarantee the same result for another plan or date. Kakagogo provides lawful connectivity planning and does not configure or promise a service intended to bypass Chinese network controls.
Buying a passport-registered local SIM
Chinese government guidance says foreigners can take a passport to service offices of China Mobile, China Unicom or China Telecom to apply for mobile service. Use an official operator shop or a clearly authorised counter, ask for the plan terms and verify the number before leaving. English support and availability of short-stay products differ by location.
Ask whether the plan includes voice minutes, SMS, hotspot use and enough high-speed data; whether it renews automatically; and how to cancel or top up. Keep the SIM packaging and receipt until the service is tested. Do not hand a passport to an unverified street seller or permit a stranger to register multiple numbers in your name.
Data planning for Chongqing and Chengdu
Maps, video calls, cloud photo backup and short-form video can consume more data than payment or messaging. Chongqing’s vertical streets make live navigation valuable, while day trips such as Dazu or Dujiangyan can involve longer periods away from hotel Wi-Fi. Download hotel addresses, tickets, translation phrases and a basic offline map before leaving each morning.
Public Wi-Fi may require a local phone number, identity step or Chinese interface and should not be the only connection. Treat unknown networks cautiously, keep the operating system updated and avoid sensitive account changes over an untrusted hotspot. A portable battery is part of the communications plan because a working data package is useless on an empty phone.
What to do when data stops working
- Confirm airplane mode is off and the correct data line is selected.
- Check the plan validity, allowance and roaming setting required by the provider.
- Restart the connection or phone according to the operator instructions.
- Use hotel Wi-Fi or the backup line to contact official support.
- Do not install an unknown configuration profile sent by a stranger.
If a local SIM was purchased from an operator store, return with the passport, receipt and packaging where practical. For an eSIM, preserve the order number and device details. Avoid deleting an eSIM during troubleshooting unless the provider confirms it can be reinstalled.
A two-connection plan for first-time visitors
Arrive with a tested roaming or eSIM layer, then decide whether a local SIM adds value after the first day. Keep the original number active for bank and account security where affordable. Families should not place every ticket, payment wallet and hotel contact on one device; share offline copies and maintain at least one independent connection.
At the end of the trip, check whether the Chinese plan renews, whether an eSIM profile contains any remaining entitlement and which accounts use the temporary number. Remove the number from travel, wallet or messaging accounts before it can be reassigned, cancel recurring service through the official operator and preserve any final receipt. Do not discard a physical SIM until all identity-linked accounts are safely and fully updated.