Thanks for the reply Daverost.
Okay, I talked about earlier about the Text Message DLC. So I was checking the DLC Catalog on the PSN Store and I saw the Text Messages in Catalog 1. However, when I checked the other Catalogs, those have the Text Messaging DLC as well. Why are there Text Messages DLC in almost every Catalog? Are they all the same or are they different?
They're the one and the same. There's a weird oddity in the DLC packs though.
For the unlock complete extra item for catalog 1, and for some of the other catalogs, you require all the cell numbers. (Despite claims, I can confirm it counts for both the PS3 and 360 versions for catalog 1, and oddly enough, Catalog 7 360.)
There's only one bunch of phone packs though - once you grab all of them for one catalog, they count towards the unlock for any others.
It's a DLC specific thing, and you don't need it really either way, unless you want to start unlocking DLC content.