When the mobile phone card is plugged into the mobile phone, there is no signal. There is no network when making a phone call, no signal when texting, and no signal when surfing the Internet. What's g

When the mobile phone card is plugged into the mobile phone, there is no signal. There is no network when making a phone call, no signal when texting, and no signal when surfing the Internet. What's going on here? Who knows? One possibility is that your mobile phone card is expired or invalid. The second possibility is that there is something wrong with the main version of your mobile phone (no card identification). The third possibility is whether your mobile phone card is inserted incorrectly (Telecom's mobile phone card can only be used in CDMA network plane, while China Mobile and China Unicom's mobile phone cards are all GSM networks).