### Answer Based on the sources, there are a few reported SMS-related issues: 1. **Non-US numbers not supported**: SMS capabilities are currently limited to US numbers only. [(1) ]() Users with non-US numbers (e.g., Australian Twilio numbers) have reported errors like

A2P Application not found for the given phone number

when trying to send SMS. [(2) ]() 2. **A2P registration requirements**: For Retell Twilio numbers, SMS requires completing a multi-step approval process including business profile, brand approval, and SMS campaign registration, which can take 2-3 weeks. [(1) ]() 3. **General SMS delivery issues**: There's at least one report of SMS failing to send. [(3) ]() If you're experiencing SMS issues, check: - Your number is a US number [(1) ]() - SMS capabilities are enabled and approved for your number - For your own Twilio numbers, ensure you've configured the SMS function with your Twilio credentials What specific issue are you encountering?

​ To learn more, see the sources I considered: [[1] Send & receive SMS](https://docs.retellai.com/deploy/enable-sms) [[2] TEXT MESSAGE ISSUE](https://discord.com/channels/1186424376300679209/1424595052595904542) [[3] Discord message from @gebstrategy on 2025-03-11](https://discord.com/channels/1186424376300679209/1294891368505937952/1349112741129879572) ​

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.

### Answer Based on the available documentation for the List Chat endpoint, there is no mention of a

pagination_key

parameter being supported. [(1) ]() The List Chat documentation shows the endpoint returns chat objects with fields like

chat_id

,

agent_id

,

chat_status

, etc., but does not document pagination parameters such as

pagination_key

or

limit

. For comparison, the List Chat Agents endpoint does support pagination with

pagination_key

and

pagination_key_version

parameters. [(2) ]() If you need to paginate through a large number of chats and the List Chat endpoint doesn't support it, you may want to reach out to Retell support for clarification or feature requests: - [Contact Sales]() - [Retell AI GitHub]() Would you like me to try to provide a general answer based on my knowledge instead?

​ To learn more, see the sources I considered: [[1] List Chat](https://docs.retellai.com/api-references/list-chat) [[2] List Chat Agents](https://docs.retellai.com/api-references/list-chat-agents) ​

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.