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How does Huawei mobile phone P20 view the short messages in SIM card 2?

Your mobile phone should have two calling cards at the same time. Just look up the SIM2 card message directly in the message. 1 SIM card icon under card short message shows 1, and SIM card icon under 2 card short message shows 2. The short messages are all together, but the difference is the SIM card logo of 1 and 2.