Iridium is replacing its existing constellation by sending 70 Iridium NEXT satellites into space on a SpaceX Falcon 9 rocket over 7 different launches.
Update – January 8, 2017
With high winds and rain in the forecast at Vandenberg Air Force Base, the first launch of 10 Iridium NEXT satellites is now planned for January 14th at 9:54:34 am PST with a back-up date of January 15th.
https://www.iridiumnext.com/#section-2
https://www.researchgate.net/figure/269338544_fig2_Figure-2-All-GNSS-satellites-and-augmentation-systems-plus-Iridium
Ping Pong satellites in space...
http://www.space.com/17589-pongsat-ping-pong-balls-space-balloon.html
http://www.defenseindustrydaily.com/Boeing-Wins-RD-Contract-for-High-Integrity-GPS-05000/
https://www.iridium.com/