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CZECH REPUBLIC (CZ)

Locale Summary

Locale nameCzech Republic
ISO codeCZ
RegionEurope
Mobile country code230
Dialing code+420

Guidelines

Two-way SMS supported Yes
Number portability availableYes
Twilio concatenated message supportYes
Message length160 Characters
Twilio MMS supportConverted to SMS with embedded URL
Sending SMS to landline numbersYou cannot send SMS to a landline destination number: the Twilio REST API will throw a 400 response with error code 21614, the message will not appear in the logs, and the account will not be charged.
Compliance considerations

Twilio strongly encourages customers to review proposed use cases with qualified legal counsel to make sure that they comply with all applicable laws. The following are some general best practices:

  1. Get opt-in consent from each end-user before sending any communication to them, particularly for marketing or other non-essential communications.
  2. Only communicate during an end-user’s daytime hours unless it is urgent.
  3. SMS campaigns should support HELP/STOP messages, and similar messages, in the end-user’s local language.
  4. Do not contact end-users on do-not-call or do-not-disturb registries.

Phone Numbers & Sender ID

AlphanumericLong CodeShort Code
Pre-registrationDynamicDomesticInternational
Operator network capabilityRequiredNot SupportedSupportedNot SupportedSupported
Twilio supported Supported Supported
Learn more
SupportedSupportedNot Supported
Sender ID preservedYes --- YesNo---
Provisioning time3 weeksN/AN/AN/AN/A
UCS-2 supportSupportedN/ASupportedSupportedN/A
Use case restrictions---

N/A

N/A

N/A

N/A

Best practices

N/A

Sender ID Registration is required for the Czech Republic. Submission by  Dynamic Alphanumeric Sender ID will be attempted on a best-effort basis. The Sender ID will be overwritten with a generic Alphanumeric Sender ID outside the Twilio platform.

N/A

Sender ID Registration is required for the Czech Republic. Submission by International Long Codes will be attempted on a best-effort basis. The Long Code will be overwritten with a generic Alphanumeric Sender ID outside the Twilio platform.

N/A

Alphanumeric - Pre-registration
Operator network capabilityRequired
Twilio supported Supported
Sender ID preservedYes
Provisioning time3 weeks
UCS-2 supportSupported
Use case restrictions---
Best practices

N/A

Alphanumeric - Dynamic
Operator network capabilityNot Supported
Twilio supported Supported
Learn more
Sender ID preserved ---
Provisioning timeN/A
UCS-2 supportN/A
Use case restrictions

N/A

Best practices

Sender ID Registration is required for the Czech Republic. Submission by  Dynamic Alphanumeric Sender ID will be attempted on a best-effort basis. The Sender ID will be overwritten with a generic Alphanumeric Sender ID outside the Twilio platform.

Long Code - Domestic
Operator network capabilitySupported
Twilio supportedSupported
Sender ID preservedYes
Provisioning timeN/A
UCS-2 supportSupported
Use case restrictions

N/A

Best practices

N/A

Long Code - International
Operator network capabilityNot Supported
Twilio supportedSupported
Sender ID preservedNo
Provisioning timeN/A
UCS-2 supportSupported
Use case restrictions

N/A

Best practices

Sender ID Registration is required for the Czech Republic. Submission by International Long Codes will be attempted on a best-effort basis. The Long Code will be overwritten with a generic Alphanumeric Sender ID outside the Twilio platform.

Short Code
Operator network capabilitySupported
Twilio supportedNot Supported
Sender ID preserved---
Provisioning timeN/A
UCS-2 supportN/A
Use case restrictions

N/A

Best practices

N/A

For the benefit of all our customers, these guidelines are provided to help you comply with applicable requirements and to help ensure Twilio's platform remains compliant with global telecommunications ecosystem requirements. These guidelines represent our current understanding of common compliance requirements generally applicable to Twilio and its customers, and do not constitute legal advice. By posting these guidelines, Twilio makes no assurances regarding the legal compliance of your application built using our APIs. You are expected to understand and abide by all compliance obligations applicable to your specific application. You should check these pages regularly for updates as telecommunications ecosystem requirements continue to evolve and change, and the information below may be updated or changed without notice.