​ To learn more, see the sources I considered: [[1] Billing overview](https://docs.retellai.com/accounts/billing) [[2] Getting charged without usage](https://discord.com/channels/1186424376300679209/1393658536398946355) ​

### Answer Charges without call usage typically come from subscription items, not from actual agent usage. These are billed separately from your metered call costs: - Phone numbers purchased through Retell are billed monthly until released [(1) ]() - Knowledge bases beyond the free tier are billed monthly - Calls per second (CPS) upgrades are billed to your payment method on file - Purchased concurrency is also billed this way These subscription items are charged at the end of each billing cycle (the 1st through the end of the month) and are prorated if purchased mid-month . So even with zero calls, you can still see charges if you have active phone numbers, extra knowledge bases, CPS upgrades, or concurrency purchases on your account. If the charge seems unexpected or doesn't match any of these subscription items, it's worth checking your Usage tab for a cost breakdown by category , or reaching out with your org ID for a specific review, since billing issues can sometimes be resolved by support directly [(2) ]() . To stop these charges, you'd need to release unused phone numbers, delete extra knowledge bases, and remove any CPS or concurrency upgrades you're not using [(1) ]() .

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