How to get a password when roaming?

. . . Are you asking about cell phones or something? It seems that roaming is not a patent for mobile phones. . . Without knowing the original password, I know that Yunnan Mobile can directly obtain a new password by dialing * 100*555*20# with its mobile phone, but other provinces don't know if it is ok. Unicom uses dynamic verification code to verify identity in the online business hall and then directly resets the password. If you know the original password, send a text message to10086/100110000 and press the SMS menu to reply. Menus and even packages in different provinces may be different. You can send a blank message first, and you will get a short message menu. Sending the service number of the operator is free.