Yitong software itself is roaming-free. As long as it is used in China, the tariffs are uniform everywhere. If your mobile phone answers the phone in other places, it is free, and it is free to surf Netease without roaming. If your mobile phone answers the phone in other places, there is a charge, because outgoing calls are equivalent to answering the phone, so roaming charges are deducted by the mobile phone operator and have nothing to do with the phone. I suggest that after you go home, change the answering number to the number of your local relatives in the settings of Netcom, so as to avoid roaming charges!