A securities account cannot be operated by two mobile phones, and the securities trading software has the function of mobile phone recognition.
A securities account cannot be logged in on two mobile phones or two computers at the same time. He is only allowed to log on to a mobile phone and a computer at the same time. You can also log in to two accounts on your mobile phone and two accounts on your computer at the same time. But ... computers can't log in to one account at the same time, and neither can mobile phones.