You can insert the card yourself, and the portable wifi can be installed with the operator's mobile phone card to use the network.
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However, in order to ensure that the card has enough traffic, it is necessary to note that there are different network standards for portable Wi-Fi, some can only support 4g of Telecom and Unicom, and some can support 4g of mobile, telecom and Unicom three operators, which should be compared and clear in the purchase