Is it free for China Mobile's 4g8 yuan package to be answered nationwide?

At present, China Mobile has completely cancelled the domestic long-distance roaming charges for mobile phones, that is, the domestic call charges are charged according to the local local telephone standard of the charges (packages). For details, you can use your mobile phone to send a text message "642" to 186 to inquire about the charges. The inquiry process is different in different provinces, cities and regions, which is subject to 186 real-time consultation.