What does EMS short message mean?

What are SMS, EMS and MMS in SMS service?

SMS: text message service. The content of short messages can be text, numbers or binary non-text data, but the average capacity of each short message is 140 bytes, which generally does not exceed 60 Chinese characters. If the user is turned off or not in the service area, the short message can be stored in the short message center and can be automatically received after the user is turned on.

EMS: enhanced short message service. It can transmit information including words, images, animations or ringtones, but it can only transmit simple black and white pictures, simple tones and animations. Based on ordinary network, the charging method is similar to ordinary SMS, and is generally calculated according to the number of bytes sent. In general, sending an EMS containing a simple picture is charged according to 2 ~ 3 ordinary short messages.

MMS: Multimedia short message service, commonly known as MMS. The full name of MMS is "multimedia message service", which is literally translated as "multimedia short message service". MMS is a completely different information service from ordinary SMS. It belongs to the upgrade service of SMS. Can send color pictures, text, audio streams, ringtones, based on SMTP protocol, a bit like ordinary mail.