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So Apple is advertising a 450 Mbps maximum downlink throughput (cat 9 or 10) but Qualcomm chipset (at least, no idea for intel LTE baseband used) is capable of Cat 12 , i.e up to 600 Mbps throughputs ? Maybe Apple is advertising 450 Mbps because only Qualcomm chipset support it ? Maybe it is firmware locked to ue cat 9 or 10 ?