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How to determine whether a text message is sent through the device identification or the mobile phone number?
Number of digits.
The mobile phone number has 11 digits, which is easy to identify. In addition, numbers with less than 11 digits such as 021XXX, 106, etc., or 20-digit numbers are sent by the device.
Mobile phone card, also known as mobile phone number msisdn, consists of 11 digits and is the only mobile communication terminal equipment. Whether it is a GSM system or a CDMA system, digital mobile phone users will get a mobile phone card (SIM card SubscriberIdentityModule or UIM card UserIdentityModule) when accessing the network.
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