Why can't I send messages and use my new mobile phone card?

There are many reasons ... 1 Maybe your mobile phone card is out of money. The solution is: recharge. Number 2 may be a newly bought card, but it hasn't been registered yet. The solution is: wait and wait. NO.3 The SMS center number in your SMS setting option is wrong, so you can't send SMS. The solution is: dial 10086 (mobile) or 100 10 (Unicom) to transfer to the manual station, ask for the number of the SMS center, and then change it. NO.4 it is also possible that your mobile phone signal is not good. For example, there is no 3G network in your area, and as a result, your access point is TDSCDMA or SCDMA. Not as long as it's not dual mode or GSM. The solution: change the mobile phone settings to dual-mode or GSM mode. No.5 may have chosen the wrong network agent. Generally speaking, the mobile phone is automatically registered on the network, but it may be changed to manual by accident, so the solution is: check the mobile phone network access point in the mobile phone settings (for example, you are a mobile card now, and when you check, you find that the access point is Unicom. Then change it to mobile. The most unpleasant and impossible thing is that your mobile phone card is broken. The solution is: go back to the house and ask the merchant to return the goods (if you can receive the text message, it is not the reason of 12, and if you can make a phone call, it is not the reason of 12). I hope this is what I think.