You can only call in late at Walmart before 5 pm. Besides, you can call in to report an absence in the following ways: seeing the HR one-on-one and reporting the situation directly or calling the store/store manager to report an absence. Furthermore, you can only get across the store/store manager or the HR when you call between 9 Am and 5 Pm. To phone them, call the official “Walmart Associate Hotline”.