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Samsung note10.5g why did qq say 4g?

A 5 g mobile phone does not mean that as long as he can use the 5 g network, he can still use the network below 5 g to 4g3g, and he can use it all. Maybe you will swear that QQ only accepts 4g networks. In addition, if you don't upgrade your mobile phone card, you may still use a 4g card.