How does Dongguan China Unicom enable weather forecast?

Guangdong Unicom’s mobile weather forecast service mainly has three functions: “morning weather”, “evening weather” and “on-demand weather”. The price of mobile phone weather forecast is 2 yuan per month. The activation method is also very convenient: the user writes the text message "11" and sends it to 10620121 to customize the local evening (morning) weather service; writes the text message "11+city area code (AM)" to customize the city's evening (morning) weather service; writes the text message " 22" to 10620121 to request the latest local weather forecast; write a text message "22+city area code" and send it to 10620121 to request the city's latest weather forecast.