DroidRTTY is an application to decode and encode Ham Radio RTTY with the build in microphone/speaker or wired to your radio. A waterfall shows the frequency spectrum of 100Hz to 2500Hz. Just slide the waterfall slide on a RTTY carrier frequency and DroidRTTY will decode the signal. In transmitting mode characters can be entered trough the keyboard.
The download of DroidRTTY for Ham Radio doesn't contain viruses or any kind of malware. Wolphi LLC is the developer of this application which can be found in the Communication category. The developer rolled out a new version of DroidRTTY for Ham Radio on Jun 12, 2017 and over 1K users downloaded and set up the app.