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Unicom, Mobile, Telecom, which card is better? Talk about its advantages

You often move to remote areas with wide signal coverage. If most of them are only used in urban areas, choose Unicom, and now launch a new free combination package, which is very cheap. In addition, China Unicom 3G and 4G have no long-distance and roaming, and 4G SMS and MMS are 0. 1 RMB/piece, so it is cheaper to add a package. Telecom, the signal is very strange, and they are all from custom machine, so it is not recommended.