That is a new one.
The sim screws only have maybe 4 threads in to hold them in the watch body. I think there are little tiny washers on the inside that holds them more or less onto the sim slot cover plate (which is a symmetric, though that is not blindingly obvious). They can fall out anyway, because any washers that might have been installed tend to break and tear and self destruct, which is convenient for Omate because then they can void any water-resistance warranty you might have felt you deserved (this is a big priority for Omate, apparently, damage control...)
Under the plate is a flimsy black plastic gasket (usually, depending on assembly issues), and you should just pry the plate out. It will eventually give up. Or, you could open the back cover and remove parts cleaning the crap out from where the drunken underpaid Umeox assembler got especially sloppy. Then you could push your sim slot cover plate out from the inside, probably.
Sent from my Nexus 7 using Tapatalk