The man sent a text message saying that he could not send it.

Unicom users can't send and receive short messages on their mobile phones for the following reasons:

1. Mobile phone settings Check whether the SMS function is turned off, whether the SMS center number is set correctly, and whether the SMS inbox and sending box are full.

2. Busy service, holidays and other peak periods of SMS sending will lead to busy system, so you can pay attention to SMS sending later.

3. SMS blacklist is included in SMS blacklist because the information sent by mobile phone contains illegal wording in telecom industry. If you need to reconnect, the owner needs to bring a valid ID card to the business hall to cancel the SMS blacklist.

If the above methods can't solve your problem, you can call the local customer service hotline 100 10 and go to the manual service desk. After registration, someone will follow up and deal with your problem.