If you use China's mobile phone number in China, you need to charge a call fee to answer or make a call in Beijing. The specific tariff standard varies according to your mobile phone package and operator. Under normal circumstances, the packages of China Mobile, China Unicom and China Telecom will contain certain contents such as call duration, SMS, traffic, etc., and extra charges will be required for the excess.
If you use your mobile phone for international roaming in Beijing, you need to pay an additional international roaming fee, which will vary according to your mobile phone package and international roaming destination. It is recommended that you consult relevant operators or inquire about relevant tariff information before using.