There is usually a probation period.
For example, a female classmate of mine works as a customer service in a company. The probation period is three months, with only basic salary and attendance award, 2500 yuan.
After one month of training, I started to work formally, because my performance was ok. After two months, I became a full member, 2500+ 1500+ others.
During the probation period, you can apply for resignation three days in advance.
After becoming a full member, it needs to be one month in advance.