Qualcomm Technologies announced Monday that it conducted the first successful extended range 5G data call over mmWave.

Range has been a key obstacle for cellphone carriers as they move to mmWave technology to take advantage of faster 5G speeds. Qualcomm’s breakthrough could speed up deployment of 5G smartphones.

Qualcomm reported that it conducted a 5G call over a 2.36 mile distance, double the distance that it had projected when it unveiled its new antenna system last year. Qualcomm worked with Casa Systems, an ultra-broadband provider, and Ericsson, the multinational telecommunications company, on the project.