Black solution is relative to the card sticker unlock and official solution, card sticker unlock here do not need to explain much, is to use the card sticker chip to crack the signal problem, and the official solution is the official release of the network lock, the mobile phone after the official solution is permanently unlocked, and for the black solution to be this time, it is actually a pseudo-official solution, the mobile phone after the black solution temporarily becomes unlocked, the use process can not use the card sticker, However, the unlocking time is not fixed, some months and years, and some days are locked.