Phone number change cant log in

Hi Kaewkawee, 

Welcome to Box Community and glad to assist!

Due to security reasons, any login related issues should be addressed with the affected user. At this rate, please have your colleague to  create his ticket and contact Box Support.

Thanks for posting! 

my colleague can't log in to box.com create a ticket due to didn't get a verification code (the code was send to previous phone number which didn't use)

How can you help us? thanks