Why can't the ipad mini card accept SMS?

I just tried mine, and mine also uses Unicom 3G network card. Open Unicom's online business hall, enter the card number, click the random password, and it will be sent to the ipad mini. The message will pop up and disappear after clicking. Enter a random password on that message, and then you can go in and change the password. I just tried mine, and it's ok. Haha, I thought I couldn't do it at first, but I kept tossing and turning online and on the phone 100 10, and I was surprised to find that it was possible! !

If it still doesn't work, you can go to the business hall to reset your password.