How to check the opening date of mobile phone number?

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Mobile phone number, also called mobile phone SIM card, consists of 1 1 digit, which is a mobile communication terminal device composed of * * * *. Regardless of GSM system or CDMA system, digital mobile phone users will get a SIM card or UIM card when they "access the network".

The mobile phone number is a "smart card" conforming to the GSM specification, which can be inserted into any mobile phone conforming to the GSM specification to realize the function of "the phone number is not random with the card", and the call fee is automatically included in the cardholder's bill, regardless of the mobile phone.