How long can China Mobile check the phone records?

You can query the records within 6 months.

The longest call record of China Mobile in the last 6 months can be found, and the call record system that is more than 6 months will be cleared. Customers can directly carry their ID cards to the local mobile business hall for inquiry, or directly log in to the online business hall of China Mobile for online inquiry. However, you need to confirm that you have the ownership and use right of the searched number before querying, otherwise you can't query.