What size of SIM does the ROKiT IO Pro 3D use? March 20, 2019 16:29 The phone uses a Nano SIM. See picture below. Related articles How can I use an SD Card? What size of SIM does the ROKiT IO 3D use? How can I update the software on my phone? Setting up your Launch Control on your IO Pro 3D / 3D / Light device How can I check the IMEI number of my device? Comments 0 comments Article is closed for comments.