After setting up two-factor authentication on Twitter, what could be the reason if you don’t receive the authentication code via SMS? In some cases, you may not have set it up as a “short message” in the first place, but assuming that you have set it up, we will introduce the possible reasons.
You entered the wrong phone number
If you do not receive a verification code when setting up two-step verification for Twitter, it is likely that you entered the wrong phone number. If you enter the wrong mobile phone number, you will not receive the verification code. When setting up a phone number for two-step verification for Twitter, you need to select a country code. If you have a Japanese phone number, select Japan and enter a mobile phone number starting with 090 or 080.
Since the country code is specified, you might think that you need to start with “80” or “90” without the first “0” and not “090” or “080”. However, in reality, “090” or “080” is fine, so try re-entering the phone number assuming that the other parts are incorrect.
There is an error on the carrier
If you are not receiving the Twitter verification code, there may be a problem with your carrier. SMS is sent and received through your carrier’s telephone line, not through a data communication line or Wi-Fi line. If your carrier is experiencing communication problems or an error occurs when sending and receiving SMS, you will not be able to receive SMS from Twitter.
Carrier communication problems may not be resolved immediately. As stable communication environments have been established, problems whatsapp lead do not occur very often, but it is true that it is a problem that can occur at any time. If you do not receive a Twitter verification code, it is better to suspect a carrier error.
A common problem for people who don’t use SMS much is that they have set their phone to block SMS. If you only allow SMS from high response rate specific senders or block all SMS, you won’t receive the verification code SMS from Twitter. Be careful, as smartphone shop staff may have set your phone to block SMS in advance.
Also, Twitter may send SMS via international lines. There are cases where you have a setting to receive SMS from domestic carriers fans data because they are more secure, but reject SMS from overseas. You may be able to reject SMS in the settings of the device itself, but you should be careful because there are also cases where they are filtered by security apps.