There is a port for your phone an Iphone 5c. To the right of the port there is a charger and ear bud port. Located above that port there is an ear bud containment unit. To secure the Pipboy to your arm follow the instructions for securing the two sides together and close the buckle at the bottom.
Slide your phone into the Iphone port. There is a small port that is big enough to fit a straightened paper clip through located opposite the buckle bottom. Fit ti through then take needle nose pliers or your hands and make a tight loop in a square form. then it ti ready for use.