Telecom directional traffic runs out of general traffic, why send text messages?

If you run out of telecom directional traffic, there is still general traffic. The reason why you can send short messages is because the transmission mode of short messages is different from the usage mode of traffic.

Short messages are transmitted through the short message center of telecom operators without using data traffic. Sending text messages involves only a short transmission of text, so even if your directional traffic runs out, you can still send and receive text messages.

General traffic is mainly used for activities such as surfing the Internet, using applications and downloading files. SMS, on the other hand, is a service based on signaling, and there is no requirement for traffic usage. This is why you can send and receive short messages even if there is no traffic.

It should be noted that although sending and receiving SMS does not require traffic, some special SMS services, such as MMS, mass SMS or international SMS, may consume some traffic. If you use these services, your general traffic may be deducted.

To sum up, if your telecom directional traffic has been used up, but there is still general traffic left, you can still send short messages, because the transmission mode of short messages does not depend on traffic.