The call was placed from Texas in the US to Japan using AST SpaceMobile's technology.
AST SpaceMobile made the call from their facility in Midland, Texas using AT&T's cellular network and a Samsung Galaxy S22 smartphone. The receiver network for the call was Rakuten, based in Japan, through AST's BlueWalker3 satellite, the largest ever communication array that has been deployed in space so far.
In addition to the voice call, AST SpaceMobile's engineers also conducted initial compatibility tests using a variety of smartphones and devices. In these tests, the smartphones successfully exchanged Subscriber Identification Module or SIM and network information directly with the BW3 satellite, a crucial step for delivering satellite-based connectivity.
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