Important: Due to specific regulations in certain countries, it is necessary to pre-register the sender of the SMS or URL included in the message to avoid blocks by local operators.
Failure to do so may result in messages being blocked.
List of Countries
Consult our table to identify the countries that require this pre-registration and those where the sender will be replaced by a numerical code, due to regulations by operators. It is important to note that generic names or those of other companies besides yours may be rejected or considered phishing or identity theft attempts.
For more details on how to request senders in specific countries and about the registration process, we recommend reading our comprehensive article. This link will provide you with additional information and step-by-step guidance to facilitate your requests and ensure effective delivery of your SMS messages.
Country | SENDER: Alpha ID supported? | URLs supported | Info |
Afghanistan | Registration required |
| Contact Support |
Albania | Yes, no pre-registration required |
| Dynamic alphanumeric sender IDs are supported; no pre-registration is required. |
Argentina | No |
| The sender ID will be overwritten. |
Armenia | Registration required |
| Contact Support |
Belarus | Registration required |
| Contact Support |
Belgium | No |
| The sender ID will be overwritten. |
Benin | Registration required |
| Contact Support |
Brazil | Yes; registration optional depending on carrier | URL pre-registration required | Registration preserves the alphanumeric sender ID on TIM, Claro and Vivo. Without registration, it may be replaced by a code or number. Contact Support. |
Bulgaria | Registration required |
| Contact Support |
Cameroon | Registration required |
| Contact Support |
Canada | No; an SMS-enabled number is required | Yes, with restrictions | Alphanumeric sender IDs are not supported. For A2P traffic, use an SMS-enabled number; toll-free numbers require verification and short codes require approval. Branded HTTPS links are allowed; public URL shorteners may be filtered. Contact Support for setup. |
Chad | Registration required |
| Contact Support |
Chile | No |
| The sender ID will be overwritten. |
China | Registration required | No | Contact support. |
Colombia | No | Registration required. Free URL shorteners cannot be whitelisted | The sender ID will be overwritten with a numeric code. Promotional or marketing traffic is prohibited between 9:00 PM and 8:00 AM. Contact Support. |
Congo Democratic Republic | Registration required |
| Contact Support |
Cuba | Registration required |
| Contact Support |
Czech Republic | Registration required |
| Contact Support |
Denmark | Yes, no pre-registration required | Registration recommended | Contact Support |
Ecuador | No |
| The sender ID will be overwritten. |
Egypt | Registration required |
| Contact Support |
Finland | Registration required | Registration recommended | Contact Support |
France | Yes* | Bitly and other shorteners may be blocked. Not recommended. | Promotional or marketing traffic is prohibited between 10:00 PM and 8:00 AM, on public holidays and Sundays. Branded URLs are recommended because public shorteners may be blocked. |
Germany | Yes | Registration recommended | Contact Support |
Ghana | Registration required |
| Contact Support |
Guinea | Registration required |
| Contact Support |
Guinea-Bissau | Registration required |
| Contact Support |
Hungary | No |
| The sender ID will be overwritten. |
India | Registration required |
| Local traffic must be registered. |
Indonesia | Registration required |
| Contact Support |
Iran | Registration required |
| Contact Support |
Ireland | Yes, with registration in ComReg |
| Register the alphanumeric sender ID with ComReg and authorize the provider or aggregator. Unregistered IDs are displayed as “Likely Scam”. Blocking has been deferred until further notice. Contact Support to arrange registration. |
Israel | No |
| The sender ID will be overwritten. |
Italy | Yes |
|
|
Ivory Coast | Registration required |
| Contact Support |
Japan | Yes | Public URL shorteners may be blocked if the carrier considers them spam. Pre-registration is recommended. | Regulations change frequently. Contact Support before sending to Japan. |
Jordan | Registration required |
| Registration is needed for local traffic for all operators. Contact Support
|
Kazakhstan | Registration required |
| Contact Support |
Kenya | Registration required |
| Contact Support |
Kuwait | Registration required |
| Contact Support |
Liberia | Registration required |
| Contact Support |
Macao | No |
| The sender ID will be overwritten. |
Macedonia | Registration required |
| Contact Support |
Malawi | Registration required |
| Contact Support |
Malaysia | No |
| The sender ID will be overwritten. For further restrictions when sending to Malaysia please contact Support. |
Mali | Registration required |
| Contact Support |
Mexico | No |
| The sender ID will be overwritten. |
Moldova | No |
| The sender ID will be overwritten. |
Montenegro | Registration required |
| Contact Support |
Morocco | Registration required |
| Contact Support |
Mozambique | Registration required |
| Contact Support |
Nepal | Registration required |
| Contact Support |
New Zealand | No on Twilio routes; dedicated short code required | URL pre-registration required | According to Twilio, New Zealand carriers require a dedicated short code and do not preserve alphanumeric sender IDs. Contact Support before sending to confirm the available route. |
Nicaragua | Yes, with pre-registration |
| The alphanumeric sender ID must be registered with carriers. Contact Support to submit the documentation. |
Nigeria | Registration required |
| Contact Support |
Norway | Yes, no pre-registration required | Registration recommended | Contact Support |
Oman | Registration required |
| Contact Support |
Pakistan | Registration required |
| Contact Support |
Palestine | Registration required |
| Contact Support |
Paraguay | No |
| The sender ID will be overwritten. |
Poland | Yes, no pre-registration required | Public URL shorteners are not allowed; use the full URL. | Dynamic alphanumeric sender IDs are supported. International numeric sender IDs may be replaced with an alphanumeric one. |
Philippines | Pre-registration required | Pre-registration required | Contact Support |
Qatar | Registration required |
| Contact Support |
Romania | Registration required | Registration required | Contact Support |
Russia | Registration required |
| Networks in Russia filter on content to prevent abuse of SMS connections, so delivery should be considered on a "best effort" basis. Contact Support |
Rwanda | Registration required |
| Contact Support |
Saudi Arabia | Registration required |
| Contact Support |
Senegal | Registration required |
| Contact Support |
Serbia | Registration required |
| Contact Support |
Singapore | Yes, mandatory pre-registration |
| Register the alphanumeric sender ID with the Singapore SMS Sender ID Registry (SSIR) and the provider before sending. Unregistered sender IDs may appear as “Likely-SCAM”. Gambling and adult content are not permitted. |
Slovenia | Registration required |
| Contact Support |
Spain | Yes, mandatory pre-registration |
| Alphanumeric sender IDs for SMS sent to Spanish numbers must be registered with the CNMC. From September 15, 2026, carriers block messages using unregistered sender IDs. Contact Support to arrange registration and prove ownership of the sender ID. |
Syria | Registration required |
| Contact Support |
South Africa | Registration required |
| Contact Support |
South Korea | No |
| The sender ID will be overwritten. |
Sri Lanka | Registration required |
| Contact Support |
Sudan | Registration required |
| Contact Support |
Sweden | Yes, no pre-registration required | URL registration: contact Support | Dynamic alphanumeric sender IDs are supported. |
Taiwan | No |
| The sender ID will be overwritten. |
Tanzania | Registration required |
| Contact Support |
Thailand | Registration required |
| Contact Support |
Togo | Registration required |
| Contact Support |
Turkey | Registration required |
| Contact Support. Gambling related traffic is not permitted to Turkey. Any content relating to gambling may be blocked by the operator. |
Uganda | Registration required |
| Contact Support |
Ukraine | Registration required |
| Contact Support |
United Arab Emirates | Registration required | Registration required | Contact Support |
United States | No. Requires local number to send. | Registration required | Messages will be blocked unless the business is registered and has its own 10-digit number. Contact Support for further restrictions on sending to the US. |
United Kingdom | We recommend registering the sender ID for greater security | Public URL shorteners may be blocked if the carrier considers them spam. Pre-registration is recommended. | Regulations change frequently. Contact Support before sending to the UK. |
Uzbekistan | Registration required |
| Contact Support |
Vietnam | Registration required |
| Contact Support |
Zambia | Registration required |
| Contact Support |