Where can I set the number of the Nokia 520 SMS Center?

Open the phone (menu), click (Information), and click (Options) (Settings) on the left, and (SMS) (information center number) will appear. I don't know what card your mobile phone uses. Mobile Unicom center numbers are different! You should know that you can search for the card you need, such as mobile phone web search (SMS center number), and then you can compare the SMS center number with the web page! If the phone number is wrong, enter the center number on the webpage into the phone! I hope my answer is helpful to you!