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What is the U-card delivery process of PetroChina?

PetroChina's big and small U cards are charged with 200 yuan oil twice a month to send 500M traffic (the highest monthly 1GB), and the traffic is given immediately, and it will arrive in the account within 24 hours and cannot be carried forward to next month; On the last 1 day of each month and the first 1 day of each month, the system does not support traffic giving, so users are advised not to participate in month-end activities as much as possible.