kwa utundu wng nnavyofaham kuna simu ambazo ktk authority certificate zk huwa zna expire mapema kama unavyojua ni mambo biashara mfano sim za nokia certificate zk huwa zna expire km baada ya miaka mitano au sita ili kupata soko ktk simu nyngne zny version mpya maana kama simu zao za zamani bado...
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