If you have purchased a new Smartphone and wish to transfer your existing IBKR Mobile Authentication (IB Key) profile from your old Smartphone to your new phone you can do so without Client Service assistance as long as you are still able to receive Text messages (SMS) on the same mobile phone number that you used when you activated the IB Key Authentication for the first time. Step-by-step transfer instructions are available in the Users' Guide.
If you do not have access to your old phone number, you would need to contact IBKR Client Services via telephone for assistance.