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China SMS messaging regulations and restrictions

There are several carrier restrictions in place when sending messages to or from China, all of which can be viewed in the table below.

Clickatell strives to use only the best connectivity for delivery to China. To ensure optimal and high performance of our API platform and delivery of messages on a direct routing class, we may use up to three or four local providers or operator connections for delivery to Chinese operators.

It’s a good idea to work with a sales advisor to ensure compliance with all SMS regulations. Get in touch now and set up your messaging program with the help of our experts.


Restriction  DescriptionDND existsNoTime restrictionsNoInternational vs local splitNoLocal trafficN/AInternational trafficN/AGeneral content restrictions

  • Customers must register a dedicated signature. Promotional and transactional messages are appended/prepended with this digital signature in square brackets to identify the source of the message.

  • The signature may only contain letters and numbers (no punctuation or special characters).

  • A maximum of eight characters (including the brackets) may be used and counts toward the total character count.

  • Once registered, signatures are added to messages automatically.

  • All message templates must be registered for whitelisting and approval by the Chinese Telecom authorities prior to the launch of live traffic. This applies to all message types, including test ones. A failure to do this can result in traffic filtering or even blocking.

  • To avoid spamming end-users, a maximum of roughly 3 messages with the same content or 15 messages with different content can be sent to one single number within 24 hours. Messages exceeding this limit may be blocked by local mobile operators.

  • Messages must be sent with Unicode to avoid content filtering and rejection by the Chinese operators. GSM (ASCII) is no longer supported and only UCS2 encoded messages may be sent.

  • URLs are not permitted in messages and will be blocked.

  • Any messages containing adult, religious, and political messages will be blocked.

Content registration requiredYesOpt-out instructions requiredNoSender ID regulationsAll sender IDs are overwritten with local long codes.Sender ID documentation requiredN/ACountry supports MNPNo


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