Isn't there a mobile phone in Unicom number to receive short messages?

In this case, you can receive short messages.

Unicom can receive short messages even without a mobile phone, and can still receive short messages within 24 hours when the mobile phone is down or in arrears. At this time, the mobile phone can't send short messages, nor can it dial the phone number, but can only receive short messages.

Unicom number has no mobile phone, so you can consider using Unicom's SMS call forwarding service, and you can set SMS call forwarding when necessary to transfer SMS calls to other Unicom mobile phone numbers.