Why can't LGV30 make a phone call?

You can call the customer service hotline of your card and ask them to help you brush the background and update the data. If it doesn't work, update the network, or if it doesn't work, use it on your mobile phone to see if someone else's card can be used. If you can, you can put it in your mobile phone again. If it can be used to show that your card and mobile phone don't match, then change it. If others can use your card and you can't, you can only consider the problem of mobile phone. You can restore the factory settings of a mobile phone, then try again and ask the customer service of the mobile phone to see if their network number is the same as that on your mobile phone. If it doesn't work, fix it.