Twilio Free Trial Limitations

Twilio Free Trial projects have some restrictions to how they can be used. This guide lists the important limitations you may run up against when testing your Twilio Application. For additional help setting up your trial project, see How Does Twilio's Free Trial Work.

Notice: To remove these restrictions, Upgrade to a paid project account.

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Phone Numbers

  • We only allow one Twilio number per trial account. To get a different phone number than the one Twilio assigned you automatically, you need to release the current number you have on the Numbers page first.
  • Phone numbers in Beta are made available to trial accounts. Check out this article on international numbers and their capabilities to find out which numbers are currently in Beta.
  • If you upgrade your account, your trial number will be carried over and charged monthly according to current Voice or SMS rates.
  • If your phone number is unused in your trial account for more than 30 days, it may be removed, as we unfortunately do not have an unlimited supply of phone numbers. That said, after returning to your Trial account you can purchase a new phone number at any time and start using your new number right away. Otherwise, if you are particularly attached to a phone number, you can upgrade your account by simply adding your credit card.

Programmable Messaging

  • Outbound messages and <Message> TwiML replies can only be sent to a validated phone number. Before attempting to send or reply to messages, be sure to verify the number. Some high cost and premium access numbers aren't reachable by default; for help enabling messages to a desired country, please see our Global SMS on Trial Accounts article.
  • You will be able to send SMS from your SMS-enabled Twilio phone number, but not from your verified personal number. This rule also applies after the trial.
  • When you send an SMS from your free trial phone number, it will begin with “Sent from a Twilio Trial account”. This message will be removed once your account has been upgraded.
  • Alphanumeric Sender IDs cannot be used with trial accounts.

Programmable Voice

  • Outbound trial calls can only be placed to a validated phone number. Before attempting to place an outbound call, be sure to verify the number.
  • Some high cost and premium access numbers aren't reachable by default; for help enabling calling to countries outside of the US and Canada, please see our Geographic Permissions article.
  • Calls to and from your free trial phone number will play a short trial message before your TwiML is executed.
  • Trial accounts can only use your account's Twilio number, or a verified caller-ID, as the caller-ID (From number) when making outgoing calls.
  • Outbound trial calls are limited to 10 minutes.
  • Incoming calls on a trial account can't be recorded unless they're forwarded elsewhere with a <Dial> TwiML command with the record attribute.
  • A maximum of 5 total inbound and/or outbound concurrent calls are possible. When 5 calls are active, any further requests will be rejected with Error 10004: Call concurrency limit exceeded for account.

Elastic SIP Trunking

  • You can fully configure an Elastic SIP Trunk for testing and placing actual calls to and from your business.
  • Outbound trial calls can only be placed to a validated phone number. Before attempting to place an outbound call, be sure to verify the number. Phone numbers from 218 countries can be verified and reached on a trial account; for help enabling calls to a desired country, please see our Geographic Permissions article.
  • Trial accounts are limited to a maximum of 1 Elastic SIP Trunk.
  • Trial accounts are limited to a maximum of 1 Phone Number.
  • Trial SIP trunks can only be used to place calls using your account’s Twilio number, or a Verified Caller-ID, as the Caller-ID/From number for all calls.
  • Calls to and from your free trial phone number will play a short trial message before connecting the parties.
  • A maximum of 4 total inbound and/or outbound concurrent calls are possible. When 4 calls are active, any further requests will be rejected.

Programmable Video

There are currently no specific restrictions for video.

Verify and Authy

  • Maximum of 25 Calls made per day via the Authy or Verify API endpoints.
  • Maximum of 35 SMS sent per day via the Authy or Verify API endpoints
  • Maximum of 100 Calls and SMS per month via the Authy or Verify API endpoints
  • Maximum of 50 Authy API registrations per minute.

Test Credentials

Each Twilio project has a set of test credentials that can be used with specifically programmed numbers to freely test application flows for purchasing phone numbers, sending SMS, and placing calls. For full details, see Test Credentials (Twilio Docs).

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