I need to change my phone number and/or email December 14, 2020 22:46 Updated Follow In the app, head to your Account screen and tap on 'My details'. Then follow the instructions to change your details. Related articles Where can I see my account details? How do I change my address? How will you protect my data? How can I freeze my card? Replacement HyperJar card £5 fee Comments 0 comments Please sign in to leave a comment.