Is the SMS call turned off or black screen?

It's turned off. In case of power failure, the mobile phone is turned off or busy.

SMS calling service: This happens when the other party's mobile phone is turned off or the signal is not good. When the other party's phone is turned on or the signal is good, you will receive a short message reminder of missed calls, being blacked out or refusing to answer. What you heard was that you were on the phone.

Short message service is a kind of communication service that Alibaba Cloud can provide for users. It supports the rapid sending of verification codes, SMS notifications and the promotion of SMS at home and abroad, and the service scope covers more than 200 countries and regions around the world. Domestic SMS supports the exclusive channel of 3 E network integration and real-time interconnection with the number portability platform of the Ministry of Industry and Information Technology. Operator-level operation and maintenance guarantee, real-time monitoring, automatic switching, and the arrival rate is as high as 99%.

Extended data:

SMS call service acceptance:

(1) SMS processing.

Open: edit the short message *2 1*+ called number ("+"sign is not required) and send it to 10086.

Cancel: Edit SMS #2 1# and send it to 10086.

(2) Call 10086 for processing.

(3) Log in to Shandong Mobile website.

(4) Go to the business hall.

SMS forwarding service charges according to the number of forwarded SMS. Suppose A sends a text message to B, and B's customer sets the SMS call to C to describe the situation. Clients A, B and C don't charge any fees for sending unsuccessful short messages. The following is a description of successful sending:

(1) Charge a according to normal point-to-point SMS.

(2) Receive B 0. 10 yuan/messages.

(3) C does not charge.

(4) For customer B, SMS forwarding does not participate in various SMS preferential activities.