How to calculate the telephone charges of Unicom and Telecom?

According to the tariff standards in Unicom card packages, different packages have different call tariff standards, and some packages also distinguish local calls, long-distance calls and roaming calls. Some Unicom packages implement national unified tariff standards. For example, if you use a package of Unicom 3G in 96 yuan, the domestic voice call duration is 240 minutes. When calling telecom users, the call time can be deducted from these 240 minutes, which can be used all over the country except Hong Kong, Macao and Taiwan. If it exceeds 240 minutes, it will be charged at 0. 15 yuan/minute.