A data-only eSIM can put maps and payment apps online while leaving you unable to receive the SMS code from your bank. That difference is easy to miss at home because both problems are described as “having service.” Treat mobile data and verification messages as two separate jobs.
Before departure
- Ask the carrier whether incoming SMS works in mainland China and whether roaming must be enabled.
- Check the cost of voice, SMS, and data separately.
- Remove SIM PIN surprises and save the carrier’s support route.
- Confirm that important accounts use the current number.
- Add an authenticator app or backup codes where the service supports them.
- Test the payment wallet and bank card while still at home.
Choose a phone setup you understand
With dual SIM, keep the home line available for messages and use the eSIM or Chinese SIM for data. Label the lines clearly. Turn off data roaming on the expensive line, but do not disable the entire line if you still need SMS. Some phones cannot keep every combination active, so test before landing.
If a code does not arrive
- Check the country code and masked destination number.
- Confirm the home line has network service.
- Wait before requesting another code; repeated requests can invalidate the earlier one.
- Turn airplane mode on and off once, then retry.
- Use the app’s voice-call, authenticator, email, or recovery option if offered.
- Contact the account provider or home carrier, not a stranger offering to receive the code.
请问，可以重新发送验证码吗？
Pronunciation: Qingwen, keyi chongxin fasong yanzhengma ma?
Could you please send the verification code again?
When a Chinese number is still useful
A local number can help with domestic delivery, restaurant queues, local service calls, and systems that explicitly require a mainland number. It does not replace the home number attached to your bank or email. Keep both until you know which service uses which identity.
FAQ
Will Wi-Fi make SMS arrive?
Not ordinary SMS. Wi-Fi calling may help if your carrier and phone support it, but do not assume that without testing.
Can hotel staff receive the code for me?
Do not use another person’s number for sensitive banking or identity accounts. For a simple restaurant queue, ask what the number will be used for before agreeing.
Should I change every account to a Chinese number?
No. Short-term visitors create more recovery problems by changing core accounts for a temporary SIM.
Official information to check
Choose the data setup: compare eSIM, roaming, and a local SIM.