Modem
The Modem will be a PLS8-E (EU Version) or PLS8-US (US Version). It provides GSM, LTE and GPS. SMS and voice is supported and tested, however it will fall back to 2G for voice on most networks. There's a CPU-GPIO controlled FET switch to disconnect the whole modem from power so you don't have to rely on the closed-source modem firmware. Also, there's a current sensor to detect if the modem is doing unwanted things. [1]
Antenna
The Antenova A10340 as seen here is listed with "Antennas Calvus SMD GSM850/ 900/1800/1900/WCDMA", although according to hns, the part in the actual retail units is the Antenova A10393 RUBRA.
Carrier Compatibility
Main article: Carrier Compatibility
US
Look for a GSM network, like Tmobile or AT&T. (Verizon and Sprint use CDMA networks, which are incompatible with the Pyra modem.)
US MVNOs
There are smaller companies which use the Tmobile and AT&T networks (i.e. Virtual operators), but you'll have to look through for the GSM carriers with a BYOD policy.
Some that may allow use of a Pyra (none yet confirmed) include:
- Cricket Wireless
 - Ting
 - MetroPCS
 - Simple Mobile
 
Australia
Australia requires the European Pyra Modem. See this Whirlpool Forum post for more details.
Europe
Pretty much everybody???
Hardware
- Thales Cinterion Model PLS8-E (European)
- AT command set
 - LTE (20,8,3,7,1); 3G (8,3,1); 2G Dual B
 - UMTS/HSPA (FDD) 3GPP
 - GSM/GPRS/EDGE 3GPP
 - GPS/GLONASS solution
 - USB interface
 
 - 2x U.FL type Molex 73412-0110 and Murata MM8430-2610RB3 surface mount RF-connectors
 - UMG5NTR - NPN Bipolar transistor used for "MODEM-IGNITE" signal.
 - ESDA6V1-5P6 - 4 and 5 line ESD protection in SOT666