What is the limit on the number of messages sent by 0P0P mobile phones?

This is the design limitation of the operator.

The reason why the number of SMS messages sent by 0P0P mobile phones is limited is that operators have restrictions on the number of SMS messages sent. Once the number exceeds this value, it may be regarded as spam messages, and then the SMS function will be turned off directly. Generally, 70 Chinese characters or 140 English characters are specified, which is a design limit. This limitation can save storage space and reduce design and production costs. Although technology has improved now, this limitation has not disappeared.

The word limit of a short message dates back to the 1980s. Due to limited technology, the information content of a single short message on a mobile phone is limited to 160 English characters or 140 bytes of binary information, that is, 70 Chinese characters (including punctuation).