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Thanks for tagging me <@904826285094756402>. I'll look through relevant sources and get back to you shortly.

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To learn more, see the sources I considered:

[[1] Purchase phone number](https://docs.retellai.com/deploy/purchase-number)
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### Answer
 

Based on the available documentation, phone numbers purchased through Retell are charged monthly (e.g., US Twilio numbers are **$2/month**, toll-free numbers are **$5/month**) . [(1) ](<https://docs.retellai.com/deploy/purchase-number>)

However, I don't have specific documentation on how billing works when you delete a number mid-cycle, or details about how upcoming invoices are calculated after deletion.

For clarity on your specific billing situation, I'd recommend reaching out directly:
- Visit [Contact Sales](<https://retellai.octolane.com/>)
- Check [<https://github.com/RetellAI/%5D(><https://github.com/RetellAI/>)

Check out these potentially useful sources:
- [Purchase phone number](<https://docs.retellai.com/deploy/purchase-number>)

Would you like me to try providing a general answer about how subscription billing typically works?

Feel free to tag <@1145576664366055464> with additional questions. I also appreciate feedback, it helps me improve.