How many words can you enter in a short message?

A short message can only input 70 words, a number and a symbol are only counted as one byte, and a word is equal to 2 bytes, which means that a short message can send 140 bytes, but some mobile phones support very long short messages, and the upper limit is determined by the mobile phone model, but it is said to be very long. In fact, the sending time is also divided into 140 bytes. For example, if you enter more than 65430 bytes in a short message.

Your mobile phone supports long messages, didn't you get it?

Displaying 159 means that you still have 159 bytes to edit. You use one byte, and your mobile phone can support 160 byte SMS at most.