Electronic devices are provided with ejectable component assemblies. Each ejectable component assembly may include a tray that can be loaded with one or more types of removable module, such as a mini-SIM card and a micro-SIM card, and inserted into the device. Each assembly may also include a cover coupled to a circuit board. The tray may be inserted through an opening in the electronic device and into a space between the cover and the circuit board. A portion of the space is contained within the pocket. A portion of the tray may be contained within the pocket when the tray is inserted into the device for holding the module at a functional insertion position within the device.