If you want to use the health code on two mobile phones, you must transfer the health code to the other mobile phone. You can log in your Alipay account or micro signal on the other party's mobile phone, so that your health code can be transmitted to the other party's mobile phone. You can also put the health code on the mobile phone desktop, which is more convenient to use at ordinary times.
Just turn on the two phones separately, and the health code will appear in both phones. The way to open it is to find WeChat, and then a small program will appear in the drop-down box. There is a health code in the program, and then it will appear, because the phone numbers of these two phones are different, but your ID card is the same when you log in.