The phone bill was suddenly deducted by 30 yuan.

Without your consent, Unicom will not customize your business for no reason. If you find that you have customized your business for no reason, it is generally related to the following reasons:

1. Check whether you have replied to relevant text messages or answered relevant marketing calls, so as to open the business;

2. Check whether others have obtained your service password and other information before handling it for you;

3. Mobile phone terminal manufacturers illegally built menus on mobile phones;

4. Because of your wrong operation, you customized or ordered the service.

Due to the diversity of services, it is more complicated to open services for no reason. I suggest you contact the Unicom staff whose number belongs or go to the business hall to verify it.