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Are all the telecommunications in Yuncheng special planes?

Unicom used to be a special card for special planes, but now it is separated, but only CDMA mobile phones can be used. The market is GSM. If you have a telecom card, you can plug it into any CDMA mobile phone bought by any telecom (but most foreign countries don't have a telecom cow B, such as BlackBerry CDMA, so you have to burn the number).