Ultrasonic pings could make it easier for future iPhones to communicate locally

Apple is researching the use of ultrasonic ranging to determine how far away iPhones are from each other before opening up lines of communication.

Apple's AirDrop
Apple's AirDrop is a highly-useful tool for many users, with it able to quickly transfer files between devices and those owned by other people. The function typically works within a limited range, which can help limit such transfers to only those within a specific area.

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