Why can't my new Unicom card send text messages?

There are two possibilities for fault diagnosis of mobile phones:

1, SMS center number is wrong. I suggest you check whether the number of the SMS center is set incorrectly. Enter "*#5005*7672#" in the "dial" of iPhone, and click "Call" to see the SMS center number set in iPhone4. Enter "*5005*7672* SMS Center Number #" in the "Dial Pad" and click "Call".

2. The card body is damaged. In other words, the card body is damaged in the process of cutting and inserting the card, which affects some functions of the card. I have to change my card in the business hall. My own card was cut to the edge of the metal when cutting, and it can still be used, but it is so slow to read the card. It takes 10 minutes to display the signal every time.