This problem occurs when you try to link a phone number to your account in the SETTINGS. This means that an account with this phone number is already registered in our system. You can register an account with just your email or just your mobile phone number. So you probably have two accounts, one registered to a phone number and one registered to email. How to solve this problem: Log into the account using the phone number you want to link..If you cannot log into your account, try resetting your password and logging in again.Transfer your funds from this account to the account where you want to link the phone number..Send a request to delete your account to https://latoken.zendesk.com/hc/en-us/articles/privacy@latoken.com, provide the phone number in the email to which the second account was registered.. Our team will process your request and delete the account. Then you will receive an email that the account has been successfully deleted. Now you can link your phone number to the second account.