Unicom's number has not been opened. Can I receive short messages when roaming abroad?

You can't receive short messages when you leave the country without opening Unicom number.

If Unicom's mobile phone number needs to be used abroad, it needs to open international and Hong Kong, Macao and Taiwan roaming rights.

If the number does not have international, Hong Kong, Macao and Taiwan roaming rights, you cannot use the mobile phone number abroad.