Hi ​@Nikki1989, 

Thank you for reaching out, and I'm sorry to hear about the yellow line appearing along the fold of your phone. I understand how frustrating this must be, especially as you've already completed the software updates and restarted the device.

As this appears to be a potential hardware or display issue, we'd recommend taking the handset to your nearest Currys or Samsung store so that a member of their technical team can inspect the device and determine the cause of the issue.

They'll be able to assess the handset and advise whether any repair or further action is required.

We apologise for the inconvenience and hope the issue can be resolved for you as quickly as possible.

Owethu