According to the Wall Street Journal, T-Mobile asked that an additional spectrum, currently reserved for public safety channels, be freed up for commercial carriers. AT&T, on the other hand, wants to keep the spectrum open for public safety organizations but supports that the spectrum be reserved for LTE (and hey, T-Mobile is up for that). The spectrum in question, if you care, is the 700 D Block band, and it certainly lines up with recent rumors circulating a deal with Clearwire.