1.Input *#06# on phone to query the corresponding SN.
2.You can get the SN from the giftbox or label of phone.
3.To ensure safety of your data, it is advisable that you should back up all existing data, software, program, then erase them from the device. It will be considered as you agree Huawei to access your personal data due to detection purpose if you don't delete them. You should also remove all removable storage media, such as SIM, Memory Card. Huawei and its authorized service center will not be responsible for any loss of data, software, or program.