The IBKR Mobile app can be installed on multiple devices, but only ONE phone/device can be active at a time for use with your username. In addition, you may only use one mobile number for authentication.
Can I install IBKR Mobile on multiple devices?
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How do I login using IBKR Mobile Authentication?
Can I have IBKR Mobile Authentication active on multiple phones?
Can I register IBKR Mobile Authentication on a second device?
As an Advisor, can I have IBKR Mobile Authentication active on multiple phones?