Why can't Unicom card make phone calls and send and receive short messages across provinces? There is nothing wrong with the mobile phone.

I suggest you check the roaming level of your mobile phone card first. If roaming is only enabled in the province, then you can't use the mobile phone card outside the province. At the same time, I suggest you check the phone bill. Roaming level can use mobile phone number and service password to log in to Unicom online business hall www.10010.com. After entering the self-service, the number information will be displayed, and you can see the roaming level of your mobile phone card.