UMI ZERO:Inventor of Built-In Three-in-One Multi-functional Card Slot More....
Providing one of the the most useful mobile phones in the world.
We set the dual SIM card slot into a replacement card slot ...
Which can hold double card SIM card, thus makes it convenient for both work and entertainment
Or you can put a SIM card and a TF card expansion card to make you phone unimpeded. See More
