If you select SMS as your authentication method, a text message with a seven-digit passcode is sent to your device. The SMS text message is sent from a 313 area code, and each passcode can be used only once.
Note: If you travel internationally and have SMS set as your two-step authentication method, the text messages you receive may incur substantial roaming charges.
The following devices support using SMS text messages to verify your identity:
- When you try to access a site that requires two-step authentication, click or tap Send SMS Message.
- A text message with a seven-digit passcode is sent to your device. Open the text message and enter the passcode at the prompt.
Note: The SMS text message is sent from a 313 area code.
- If you did not receive a text message after a couple of minutes, click or tap Send Another SMS Message.