The only GA unit I know of is a Garmin GSR56 which enables the following (quoted from the website)
Global weather and communication tools enhance flight safety with access on compatible displays
Services include graphical radar imagery, METARs, TAFs and more
2-way text/voice communication keeps you in touch anywhere
All-inclusive rate plans with weather, voice and text start at $80 per month
Pairing a GTN™ or GTN Xi series navigator and Flight Stream 510 enables wireless text and voice calling from a mobile device
I have used this - but the plans are very expensive