How long can the content of short messages be deleted?

Communication records, including SMS records, are kept in most areas for half a year. Through some special channels, we can not only find the number of messages sent, but also find the detailed content, which makes some people very worried. However, some people always delete them. [43 12 (* > .& lt* ) ~@ _^ 、 ~ 3770 〗

Communication records, including SMS records, are kept in most areas for half a year. Through some special channels, we can not only find the number of messages sent, but also find the detailed content, which makes some people very worried. However, some people always delete them. [43 12 (* > ~.& lt* ) ~~@ _^ 、 ~ 3770 〗

Communication records, including SMS records, are kept in most areas for half a year. Through some special channels, we can not only find out the number of messages sent, but also find out the detailed content, which makes some people very worried. However, some people always delete them. [43 12 (* @ > .& lt* ) ~@ _^ 、@ ~ 3770 〗

Communication records, including SMS records, are kept in most areas for half a year. Through some special channels, we can not only find the number of messages sent, but also find the detailed content, which makes some people very worried. However, some people always delete them. [43 12 (* > .& lt@ * ) ~@ _^ 、 ~ 3770 〗