Adding your phone to your Twitter account using one of Twitter's international long codes is a leap of faith. Because Twitter cannot reply to you to confirm we've received your text messages, you may be running into some problems and not know why. Here is some troubleshooting advice if you've had problems adding your phone via international long code.
To check if you added your phone correctly, you'll need to go to a computer and log in to your Twitter profile at www.twitter.com. Send a text message to your Twitter long code with a Tweet you want to post. Wait a few minutes. If the Tweet shows up on your Twitter profile online, you added your phone correctly. If you don't see the Tweet show up on your profile, your phone is not added. Read on.
Send the word STOP to your Twitter code. This will cancel the phone activation process and you can start over. Send the word START to begin again adding your phone. Follow the steps to add your phone again via long code. You may have to try this multiple times.
Many phones will append a signature or "Re:" to text messages. If your phone is doing this, Twitter will not be able to recognize the username and password you've sent. Try again, and make sure your messages contain ONLY the characters in your username or password.
Do not include quotes, the @ symbol, or any other uneccessary punctuation (besides underscores) in your texts. Also, make sure your phone does not capitalize the first letter of your password – passwords are case sensitive!
Your carrier may not be cooperating with Twitter right now. We're sorry about this, but there's little we can do to help. We encourage you to speak with them, as we are always working to support more countries and add more carriers.
In the meantime, there are other ways you can access Twitter.
If you read this entire article and would like to report an issue to our support team, please file a ticket here.