Non-Adnan phone records

I had an interested look through this:

http://viewfromll2.com/2014/11/23/serial-a-comparison-of-adnans-cell-phone-records-and-the-witness-statements-provided-by-adnan-jay-jenn-and-cathy/

and wondered if the cops pulled up anyone's phone records other than Adnan's? For a case that centres so much around phone calls and memories of phone calls, did the police try and pin this stuff down any? I'm not a detective, and I'm certainly not a detective looking to maintain a high clearance rate so perhaps not concerned with things that might muddy my case, but in a case with little in the way of solid facts, and a lot of stories floating around, I'd want to get as many things verified as possible.

For all the mysterious incoming calls - not many people had Adnan's new mobile number. Is there any reason to not get the phone records of those who had it, to do a little cross checking?