SMS is a best effort protocol, meaning our carrier partners will do its best effort to deliver the message to handsets but there may be failures. Sometimes due to high network traffic or spam filters, you won't receive the text message.
There are some things you can try to improve the chances of receiving a code:
- Install the Mobile App. Opening http://www.authy.com/install on your phone browser will tell you if we have an app for your phone. If we do, simply install it and configure it. Make sure you use the same phone number as you have in the Haulix website you use Two-Factor Authentication for.
- Check with your carrier: Some cell providers may actually be pretty helpful in diagnosing the problem if you ask. For example, some US Sprint customers may not realize their phone plan default denies SMS from 'short codes' Authy may be using. You can try texting 'Allow 78156' to the number 9999 to see if Authy's primary US short code 78156 can reach your handset after being approved by you. Similarly, T-Mobile users may have opted out of this type of message without knowing it, and these messages might be blocked.
- Try another number: If you don't get the code after several attempts, contact firstname.lastname@example.org. We'll help you update your number or turn two-factor authentication off.