see as you have mentioned like you are about to have this blackberry phone but in my opinion it would be better if you wait before getting the latest bold.
Rather a rapid exploration around this forum will assist you understand that a enormous majority of the blackberry bold devices are being arbitrarily bricked after charging, thus according to me you should get the phone which is either having android OS. I am not that happy with the performance of os7. Though I am having another mobile but still I can say that with the BB 9900 as well, you’ll not get that expected result with the phone.
Thus I would rather suggest you to stick with the OS which is installed currently in the device and not to look for the OS7.
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