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Fix: Unable to Buy a Phone Number in Assistantz.ai

Updated September 17, 2026 · Troubleshooting · by the Assistantz.ai team

Short answer

A failed number purchase is usually one of three things: the sub-account's number limit is too low, the wallet balance is insufficient, or the account lacks permission to buy numbers. Check and adjust limits and balance at the agency and sub-account level, confirm permissions, and try a different area code if yours isn't available.

Video walkthrough: Fix: Unable to Buy a Phone Number in Assistantz.ai

A failed number purchase almost always traces back to one of three things: an account limit, an insufficient balance, or a missing permission. Work through them in order.

Steps

  1. Check limits. In the admin account, go to sub-accounts and confirm the number of phone numbers allowed is sufficient for what you’re trying to buy. Adjust the limit if needed and save.
  2. Verify balance. Confirm there’s an available balance at both the agency and sub-account level. Add balance, enter payment details, and consider turning on automatic payment so this doesn’t happen again.
  3. Resolve a bad request error. If you’re seeing a bad request specifically, check: sufficient balance, area code availability, and that the account making the purchase actually has admin permission to buy numbers. Adjust permissions by editing account settings, or invite additional team members with the right access if needed.
  4. Try an alternate area code. If the error is really about area code availability, try a different one — some area codes aren’t available through the underlying telephony provider due to wholesale restrictions outside Assistantz.ai’s control.

Cautionary notes

Check and adjust both number limits and wallet balance together — fixing only one and not the other still leaves the purchase blocked. Verify permissions and area code availability specifically when troubleshooting a bad request error, since those are the two most common causes.

Next step

Once you can buy numbers again, continue with how to purchase and assign a phone number to your AI caller, or if you’re bringing your own number through a telephony provider instead, see how to import a Twilio phone number for AI calling.

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