### Answer
Correct—Telnyx is not supported for SMS with Retell yet. [(1) ](
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SMS capabilities are currently available only for Retell Twilio numbers and your own Twilio numbers.
Workarounds:
- Use a custom function to call the Telnyx SMS API directly during the call [(2) ](
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- Purchase a Twilio number through Retell and apply for SMS capabilities [(3) ](
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- Bring your own Twilio number with SMS already enabled and connect it via SIP trunking
If you go with Twilio, you'll need to complete the A2P registration process (business profile, brand approval, and SMS campaign approval) . [(1) ](
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