back to Earth to dispose of them. Sky and Space Global intends to replace 25 percent of the constellation each year, replacing 50 satellites with new versions. Satellites will come with a propulsion system that is non-toxic and non-hazardous in terms of explosiveness. The first three demonstration satellites called Blue, Green and Red Diamond, or together referred to as the "Three Diamonds", were built by GomSpace and will be launched by the ISRO's PSLV-XL. They will immediately provide commercial services to Sat-Space Africa and BeepTool LLC. The initial constellation of 200 satellites will be built by GomSpace as well and launched into five orbital planes, one in equatorial and four in inclined near-equatorial orbits. Service coverage will span from 15 degrees south latitude to 15 degrees north of the equator. Virgin Galactic has the contract to launch subsequent satellites. The company plans to provide communications services to Virgin Galactic's Cosmic Girl which will act as launch platform for smallsat orbital launch vehicle LauncherOne. As of December 2019, the company lowered the number of satellites planned to be launched due to funding issues, planning to launch only 8 satellites by the end of 2020. Satellite list Frequency bands Sky and Space Global's constellation is planned to use spectrum in the S band and L band for mobile communication coverage, S band for inter-satellite links and again S band and UHF for mission control. On 27 September 2016 the company announced that it has received approval from the United Kingdom's Ministry of Defence to use its UHF frequencies for command and telemetry of the three demonstration satellites until the end of 2019 with the possibility to extend this timeframe. User terminals On 20 September 2016 Flextronics Israel Ltd signed a memorandum of understanding for the design, development and production of end user devices for Sky and Space Global's narrowband communication system. In January 2017 Ayecka Communications Systems has been contracted to build prototype hotspots, which will allow any mobile device, including tablets, to connect to the SAS satellite network using WiFi. On 20 February 2017 Sky and Space Global announced the signing of a memorandum of understanding with SocialEco Ltd, a company that produces a low-cost smartphone set to enable digital financial inclusion of the 4 billion people living on less than $8 per day. The companies intend to explore the integration of an SAS app in SocialEco's smartphone and the development