Apple’s first folding phone arrives in stores on Friday, bringing the advantages of a flexible display to iPhone loyalists. Such devices also have their own unique care and protection considerations. Folding screen phones have their upsides. Owners can have a pocket-size device that expands into a bigger seamless screen and can also act as its own stand or tripod. But the technology also requires a bit more attention than a traditional smartphone.Many users have reported shipping dates for preorders of the Duo are slipping into January, so buyers could face delays. Apple hasn't posted any online information yet on how…