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What if there is no SMS verification code in the mobile phone business hall?

There are several possibilities that Unicom APP can't receive SMS verification code: 1, and the mobile phone number is not yours or not at hand, so it can't be found. 2. The mobile phone has no SMS function and cannot receive the verification code. 3. The mobile phone is in normal condition, but the verification code cannot be received. Need to contact the customer service in this province to check the reason.