As far as P25, NH was ahead of most of the US (for better or worse). The vast majority of Law Enforcement has been P25 for several years. However, only a few Fire Departments use P25 as a primary mode and all maintain some level of analog capability.
NH's communications landscape is much simpler than Massachusetts. Over 95% of NH operates VHF High-Band; over 99% for Law Enforcement. There are a handful of Fire Departments still on Low-Band, but typically have some sort of High-Band access. State DOT is UHF, Emergency Management is Low-Band (when used). Two cities, Manchester & Nashua use 800Mhz trunked systems; but have some High-Band access (esp. Nashua).
P25 is slow moving on the Fire-EMS side because most are volunteer and/or use toning and pagers (minitors, swissphone) to alert members. Also they have seen the coverage issues police face on a regular basis and understand analog travels farther in our granite rich, hilly environment.
As far as a "Statewide" system. No, that isn't likely to ever happen. NHSP tried awhile back to recruit local PD's so they could grab up their frequencies for a VHF trunked system. But it never materialized. NH tried 800Mhz in the 80's and it was all but a total failure; with the last user (NH Marine Patrol) resurrecting a High-Band frequency they had a few years ago.
Is the state or local police or fire departments in New Hampshire using or going to use the APCO Project 25 system as is currently being done in Massachusetts for the state police? I seem to be getting conflicting information about this. What's the deal?