My mobile phone is Unicom card in Changzhou, Jiangsu, but I am in Gansu now. Excuse me, how should I call to inquire about my mobile phone business?

The area code of Changzhou, Jiangsu Province is 05 19. You can call 05 19 100 10 for consultation. But there is a roaming charge for calling this number. I suggest you go to Unicom official website to check www.10010.com. If you have the password of the query list, you can directly check the bill. If you don't have a password, you can click official website to forget the password and modify one. There is also a short message query method, but I don't know if it is a national unified code. You can try. Content HF is sent to 100 10 to check the phone bill, and content YE is sent to 100 10 to check the balance. You'd better go to official website to check it out.