Check the network standards supported by the mobile phone. If they all support it, it will be full netcom. Operator network standard: mobile network standard: mobile TD-LTE, TD-SCDMA, GSM Unicom network standard: Unicom TD-LTE, Unicom FDD-LTE, WCDMA, GSM telecommunication network standard: Telecom TD-LTE, Telecom FDD-LTE, CDMA2000, CDMA. Specifically, you can check the mobile phone manual or enter the mobile phone system to check the mobile phone model. There is also a mobile phone model on the mobile phone network access license. Then, according to the brand model of the mobile phone, search and query the corresponding model parameters on the Internet to judge the network standard of the operator to which the terminal belongs.