article_snippet: This means that if an offender attempts to sign up for other accounts using these details Twitter will be able to intervene.
article_snippet: When people sign up by email people are also given the option to add a phone number (pictured).
article_snippet: When people sign up to Twitter people are required to provide an email address, which is then validated.
article_snippet: Adding a phone number is an optional step and is predominantly used if people want to receive text notifications or setup two-step verification.
article_snippet: Under the reported plans, once a user is banned these email addresses and phone numbers will be stored and cross-referenced each time a new user signs up to the site.
article_snippet: MailOnline has contacted Twitter for more information about how users details will be stored .