LIKE A GLOVE: Contoured Specifically for the Sonim XP3plus 4G Flip Phone; Keeps Your XP3900 Stable and Accessible at Close Range ROTATION: Ratchet Clip Will Turn/Lock In Different Positions Vertical, Horizontal, etc. Low Profile Clip Keeps Your Phone Secure At Your Side. Industrial Durable Polycarbonate with Textured Matte Grid Pattern CARRY AND CONCEAL: The 'Face-In' Design Keeps Your Screen Protected and Concealed While on the Jobsite [PLEASE READ]: Only fits the XP3plus 4G model. Correct model number is XP3900 and that phone was released in 2021 (see compatibility picture)