im having the same problem ...i ve read the others requests for the sim card slot. Tryed to contact my seller (CooliColl) but was not solved. i send also via Skype the serial no to wendyzhang681 on 4/25/16 but no response since.
Pls Advice threw Skype or email
As far as i know , all sim trays were distritute to the re-seller to give away to the customers in need.
The news from our after-sale service is that now we have no extra sim tray available. Really sorry for this.
please you should go back to your supplier to ask for a free sim card tray.