# Concepts

- [SMS parts and message length](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/sms-parts-and-message-length.md)
- [SMS message types and compliance](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/sms-message-types-and-compliance.md): Bird supports various SMS types with compliance enforced per number.
- [Opt-in and opt-out compliance](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/opt-in-and-opt-out-compliance.md)
- [Choose the right sender : Availability and restrictions by country](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/choose-the-right-sender-availability-and-restrictions-by-country.md)
- [SMS Country Information Guide: Africa (A-L)](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/choose-the-right-sender-availability-and-restrictions-by-country/sms-country-information-guide-africa-a-l.md)
- [SMS Country Information Guide: Africa (M-Z)](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/choose-the-right-sender-availability-and-restrictions-by-country/sms-country-information-guide-africa-m-z.md)
- [South Africa](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/choose-the-right-sender-availability-and-restrictions-by-country/sms-country-information-guide-africa-m-z/south-africa.md)
- [Nigeria](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/choose-the-right-sender-availability-and-restrictions-by-country/sms-country-information-guide-africa-m-z/nigeria.md)
- [SMS Country Information Guide: Asia (A-K)](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/choose-the-right-sender-availability-and-restrictions-by-country/sms-country-information-guide-asia-a-k.md)
- [Japan](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/choose-the-right-sender-availability-and-restrictions-by-country/sms-country-information-guide-asia-a-k/japan.md)
- [India](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/choose-the-right-sender-availability-and-restrictions-by-country/sms-country-information-guide-asia-a-k/india.md)
- [China](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/choose-the-right-sender-availability-and-restrictions-by-country/sms-country-information-guide-asia-a-k/china.md)
- [SMS Country Information Guide: Asia (L-Z)](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/choose-the-right-sender-availability-and-restrictions-by-country/sms-country-information-guide-asia-l-z.md)
- [Malaysia](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/choose-the-right-sender-availability-and-restrictions-by-country/sms-country-information-guide-asia-l-z/malaysia.md)
- [Singapore](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/choose-the-right-sender-availability-and-restrictions-by-country/sms-country-information-guide-asia-l-z/singapore.md)
- [SMS Country Information Guide: Caribbean](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/choose-the-right-sender-availability-and-restrictions-by-country/sms-country-information-guide-caribbean.md)
- [SMS Country Information Guide: Central America](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/choose-the-right-sender-availability-and-restrictions-by-country/sms-country-information-guide-central-america.md)
- [SMS Country Information Guide: Europe (A-M)](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/choose-the-right-sender-availability-and-restrictions-by-country/sms-country-information-guide-europe-a-m.md)
- [SMS Country Information Guide: Europe (N-Z)](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/choose-the-right-sender-availability-and-restrictions-by-country/sms-country-information-guide-europe-n-z.md)
- [SMS Country Information Guide: Middle East](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/choose-the-right-sender-availability-and-restrictions-by-country/sms-country-information-guide-middle-east.md)
- [United Arab Emirates](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/choose-the-right-sender-availability-and-restrictions-by-country/sms-country-information-guide-middle-east/united-arab-emirates.md)
- [SMS Country Information Guide: North America](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/choose-the-right-sender-availability-and-restrictions-by-country/sms-country-information-guide-north-america.md)
- [Messaging Best Practices - NORAM SMS / MMS](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/choose-the-right-sender-availability-and-restrictions-by-country/sms-country-information-guide-north-america/messaging-best-practices-noram-sms-mms.md)
- [Canada](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/choose-the-right-sender-availability-and-restrictions-by-country/sms-country-information-guide-north-america/canada.md)
- [United States](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/choose-the-right-sender-availability-and-restrictions-by-country/sms-country-information-guide-north-america/united-states.md)
- [Prohibited Content - NORAM SMS / MMS](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/choose-the-right-sender-availability-and-restrictions-by-country/sms-country-information-guide-north-america/prohibited-content-noram-sms-mms.md)
- [SMS Country Information Guide: Oceania](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/choose-the-right-sender-availability-and-restrictions-by-country/sms-country-information-guide-oceania.md)
- [New Zealand](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/choose-the-right-sender-availability-and-restrictions-by-country/sms-country-information-guide-oceania/new-zealand.md)
- [Australia](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/choose-the-right-sender-availability-and-restrictions-by-country/sms-country-information-guide-oceania/australia.md)
- [SMS Country Information Guide: South America](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/choose-the-right-sender-availability-and-restrictions-by-country/sms-country-information-guide-south-america.md)
- [MMS sizes and limitations](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/mms-sizes-and-limitations.md): Bird enables you to send and receive MMS messages, including multimedia content, to and from a selected group of countries. Currently, you can only send MMS within the US and Canada.
- [Automatic sender selection](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/automatic-sender-selection.md)
- [United States SMS Registration](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/united-states-sms-registration.md)
- [Setting up a SMS consent flow](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/united-states-sms-registration/setting-up-a-sms-consent-flow.md)
- [SMS Privacy Policy and SMS Terms of Service](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/united-states-sms-registration/sms-privacy-policy-and-sms-terms-of-service.md)
- [SMS Toll-free number](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/united-states-sms-registration/sms-toll-free-number.md)
- [TFN Verification](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/united-states-sms-registration/sms-toll-free-number/tfn-verification.md)
- [Additional Costs for using TFN](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/united-states-sms-registration/sms-toll-free-number/additional-costs-for-using-tfn.md)
- [How-to Guides](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/united-states-sms-registration/sms-toll-free-number/how-to-guides.md)
- [Purchase a Toll Free Number via Bird](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/united-states-sms-registration/sms-toll-free-number/how-to-guides/purchase-a-toll-free-number-via-bird.md)
- [Register a US or Canadian TFN for SMS via Bird](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/united-states-sms-registration/sms-toll-free-number/how-to-guides/register-a-us-or-canadian-tfn-for-sms-via-bird.md)
- [SMS 10DLC](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/united-states-sms-registration/sms-10dlc.md)
- [How-to Guides](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/united-states-sms-registration/sms-10dlc/how-to-guides.md)
- [Purchase a 10DLC number via Bird](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/united-states-sms-registration/sms-10dlc/how-to-guides/purchase-a-10dlc-number-via-bird.md)
- [Register a 10DLC brand via Bird](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/united-states-sms-registration/sms-10dlc/how-to-guides/register-a-10dlc-brand-via-bird.md): Quick overview and step-by-step on how to register a new 10DLC Brand via Bird's Dashboard. Please read supporting articles for details.
- [Register a 10DLC Campaign via Bird](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/united-states-sms-registration/sms-10dlc/how-to-guides/register-a-10dlc-campaign-via-bird.md): 10DLC Campaign is the Use Case of your sender. Quick overview of 10DLC Campaign Registration. SMS Compliance is key. Please read supporting articles for details.
- [Install SMS 10DLC](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/united-states-sms-registration/sms-10dlc/how-to-guides/install-sms-10dlc.md)
- [Delete inactive 10DLC campaigns to avoid additional charges](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/united-states-sms-registration/sms-10dlc/how-to-guides/delete-inactive-10dlc-campaigns-to-avoid-additional-charges.md)
- [Throughput and Daily Caps](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/united-states-sms-registration/sms-10dlc/throughput-and-daily-caps.md): 10DLC brand and campaigns are limited in 2 ways
- [Brand registration](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/united-states-sms-registration/sms-10dlc/brand-registration.md)
- [Campaign registration](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/united-states-sms-registration/sms-10dlc/campaign-registration.md)
- [Additional costs for using 10DLC](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/united-states-sms-registration/sms-10dlc/additional-costs-for-using-10dlc.md)
- [10DLC FAQs](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/united-states-sms-registration/sms-10dlc/10dlc-faqs.md)
- [Choosing the right senders](https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts/choosing-the-right-senders.md)


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.bird.com/applications/channels/channels/supported-channels/sms/concepts.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.