Filtring array with custom objects

Question

I want to filter an array from another array which contain custom objects. Below example of dictionary.

NSArray *ContactsArray = [mainArray valueForKey:@"phoneNumber"];

I have tried with

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"phoneNumber IN %@",mainArray];

NSArray *ContactsArray = [array2 filteredArrayUsingPredicate:predicate];