I sent 205 to Unicom, but there was no reply.

If you sent a short message instruction 205 to Unicom, but did not receive a reply, there may be the following reasons:

1. Sending instruction error: If you enter an incorrect SMS instruction, the system may not receive and process your request correctly. You can check whether the instructions you sent meet the requirements of your Unicom operator. If it is wrong, please correct the instruction and try to send it again.

2. The system is busy: If the Unicom system is currently in a busy state, it may affect the speed of receiving and processing short messages. You can wait patiently for a while, or try to send the instruction again at another time.

3. SMS is intercepted: some SMS messages may be intercepted by the anti-spam mechanism of the operator, which makes it impossible to reach the target number successfully. You can check your spam mailbox or blacklist to confirm whether there is a similar interception record.

4. Abnormal sms channel: If sms channel of China Unicom fails or is abnormal, it may lead to abnormal reception and processing of short messages. You can contact Unicom customer service or inquire whether there are related system failures or maintenance notices by other means.

If the above methods still can't solve the problem, I suggest you contact Unicom customer service or go to the local Unicom business hall for consultation, so as to get more detailed help and solutions.