Pocket25, by Sarah Rose from SignalsEverywhere.net,
turns your Android phone into a full-featured P25 digital trunking
scanner using an inexpensive RTL-SDR dongle. It’s
built on the DSD-Neo decoder, bringing the same class of P25
decoding you’d normally need a desktop PC for, straight to mobile.
What Pocket25 does
Pocket25 is designed specifically for APCO P25 systems:
- Phase
1 (FDMA / C4FM) — fully supported
- Phase
2 (TDMA / QPSK) — currently in testing
- True
trunk tracking — follows conversations across control channels so
you don’t miss replies
Automatic system setup
Pocket25 integrates with the RadioReference database:
- Search
your county or city
- Select
the system
- Import
and start listening
No manual frequency typing required.
Live signal data
While audio is playing, Pocket25 also shows what’s inside
the digital signal:
- Talkgroup
IDs, Radio IDs, and NAC
- WACN,
System ID, Site ID, RFSS
- Encryption
and emergency flags
You can actually see what’s happening on the network, not
just hear it.
Filters and logs
- Whitelist
or blacklist specific talkgroups
- Review
call history and activity
- Manual
tuning for conventional (non-trunked) channels
Hardware support
- Works
with RTL-SDR dongles using a simple USB OTG cable
- No
root required
- Built-in
drivers for low-latency performance
- Can
connect to remote rtl_tcp servers over a network
Under the hood
Pocket25 uses DSD-Neo and mbelib,
giving you accurate, high-quality P25 decoding from well-established
open-source code.
App download
https://sarahsforge.dev/products/pocket25
Requirements
- Android
8.0 or newer
- RTL-SDR
V3, V4, or compatible RTL2832U dongle
- USB
OTG cable
Legal note: Pocket25 is intended for authorized
radio monitoring only. Always follow local laws regarding radio interception
and encryption.
