What is the difference between pdu and text mode of GSM SMS?

Text and PDU (Protocol Data Unit) modes are usually used to send short messages. It is easy to send and receive short messages in text mode, but the biggest disadvantage is that you can't send and receive Chinese short messages. PDU mode not only supports Chinese short messages, but also can send English short messages. PDU mode can use three codes to send and receive short messages: 7-bit, 8-bit and UCS2 code. 7-bit encoding is used to send ordinary ASCII characters, 8-bit encoding is usually used to send data messages, and UCS2 encoding is used to send Unicode characters. The general PDU coding consists of thirteen items: ABC D E F G H I J K L M.

1. Text mode is plain text mode, and different character sets can be used. Technically, it can also be used to send Chinese short messages, but domestic mobile phones basically do not support it, mainly used in Europe and America.

2.PDU mode is supported by all mobile phones, and any character set can be used, which is also the default coding method of mobile phones. The text mode is simple and not suitable for custom data transmission.