For 3.5mm ModMics:
Tablets and Smartphones require a Y adapter like this one. Simply plug both the headphone and the mic into the Y adapter first, then plug it into the 3.5mm port on your device. Note that you can not use only a mic in a smart device; you need both mic and headphones plugged in to operate.
For Wireless & USB ModMics:
The ModMic Wireless & ModMic USB require finding a way to convert the USB type-A to a compatible USB format for your device, such as USB-C. It may not work with all devices.