Prepare mobile payments
Ask your bank whether your card is enabled for overseas use. China's official guide describes linking eligible international cards to Alipay or WeChat Pay. Download apps from official sources, follow the current registration instructions and check fees, identity checks and card support with the provider; acceptance can vary.
Bring a backup
Ask hotels and merchants whether they accept your card directly. Keep a second payment method and some renminbi cash. Check bank and currency-exchange charges before travelling, and never share one-time verification codes.
Choose a data plan
Check your phone supports eSIM and is unlocked if you intend to use another provider. Confirm mainland China coverage, activation steps, roaming charges, data allowance and whether the plan includes calls or text messages. Install and test according to your provider's instructions before departure when possible; keep your home number accessible for bank verification.
Have a connection alternative
A physical SIM or international roaming may be an alternative, depending on your phone and provider. The Chinese government's guide says visitors can ask operators about a SIM at their service offices using a passport. Save your hotel address and directions offline before arrival.