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3 months ago361 passed, 30 warnings, 40 skipped in my device and network.
361 passed, 30 warnings, 40 skipped in my device and network.
I wonder if your K400 is defective. I have the old black & white K400r (refurbished?) and the batteries last for many months even when I forget to switch it off.
USA still has 2G, but 3G is definitely no longer around. Those frequencies have been portioned out for 4G LTE and 5G.