If your microphone or amp has an XLR connector (usually male) you'll need an 1/8" 3.5mm) male to female XLR adapter LIKE THIS ONE to connect to the microphone, in addition to any adapters you need to connect both a microphone and headphone to your particular smart device.

You'll also need an XLR Male to Female cable of an appropriate length to reach from your microphone to your smart device.

Here's another adapter, found by Meri Ziev's husband Arthur, that goes directly from your smart phone TRRS to an XLR Microphone and Headphones, so you eliminate one adapter. Movo-TCB2 (This adapter seems to go in and out of stock with various suppliers, so you may have to search for it on Google.)