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Mobile phone cards will be issued after entering the university. What about the original mobile phone card? Can I continue to use it without any packaging?
Yes, but if you switch to a mobile phone card without a package, the phone bill will be very high if you want to use it.
Also, if it stays there, it will expire. The recharge card has a validity period, generally 3 months in 50 yuan, and so on, the longest is 2 years.
In other words, if you want to keep it, you must keep filling it.