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Why can't Huawei 8xmax Card 2 send out information?

you need to open a volte card to use it. You need to set the card without Volte as the default mobile data card (setting >; Wireless and network > Dual card management > Default mobile data), and at the same time, turn on the high-definition call switch of Volte (setting >; Wireless and network > Mobile network > VoLTE call).