Friendly Reminder: 1. This Android OS Phone is designed only to work with the current Android OS installed in it. Any alterations such as upgrading a newer version or installing other third-party systems may result in abnormal working. 2. The stated ROM amount shows the maximum available ROM with nothing installed. However, the Android OS and pre-installed software from the manufacturer will occupy some space of the ROM. 3. Unlocked for worldwide use, please ensure local area network is compatible. Copy to open the link "http://maps.mobileworldlive.com/" OR "http://willmyphonework.net/" for checking the Network Frequency of your country for reference. Please also check with your carrier/provider before purchasing this item.