This season FIRST changed the FTC platform. The old field control with the Samantha modules is replaced by two mobile devices and no central field control. Teams (both veteran as well as rookie teams) need to buy materials to be able to use this new system.
In the new FTC system, smart phones and tablets are used as robot control and driver station. In this years game manual 1, FIRST limits the devices to either the ZTE speed or the Motorola Moto G 2nd generation (RE01.a iii).
Not all teams have access to these devices due to availability or cost. Therefore we will allow other smart phones and tablets to the FTC competition. However not all mobile devices are compatible with the new platform and only a limited set tested and are known to work with the system, see mobile devices