You can only create an account on Twitter if you have a local phone number in the country in which you are located. If you are located in say Brazil and you try to create an account using the UK telephone number that we supply you will get an error message saying that the phone number is invalid.
In order to get around this problem we would suggest that you register with Twitter using your browser on a desktop PC. This gives you the option to ‘use email instead’ to register.