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The Alliance for Telecommunications Industry Solutions (ATIS) issued the first International Mobile Subscriber Identity (IMSI) numbers for operators using 3.5GHz spectrum in the US, in a move meant to accelerate commercial deployments in the band.

Development of the 15-digit code will allow operators using the spectrum, commonly referred to as Citizens Broadband Radio Service (CBRS), to interconnect with other networks. ATIS developed the IMSI in collaboration with the CBRS Alliance.

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