https://malcolm-en-gb.s3.eu-west-1.amazonaws.com/instances/ssTv2cUQS2/resources/QHq0ukTqGk/US%20-%20Update%20details.png (US - Update details (1).png) Sign into your desktop account using either email or app verification. Click on your name in the top-right of the screen and select 'My details'. Select the edit icon next to the cell number. Pick your area code, enter your new number and click 'Save'. Once updated, click the 'Verify' button. Enter the code sent to you via SMS and click 'Confirm'. You can now use SMS verification to sign into your desktop account.