Why can't my card send text messages, but I can make phone calls?

If your mobile phone can make calls and receive short messages normally but can't send short messages, it may be that the number of the short message center is wrong. You can reset it and try again. The number of SMS center can be clicked on the online customer service in Unicom's online business hall, and the number of "XX province number SMS center?" After the inquiry. I hope it helps you!