Amazon.com: 1 TRRS Jack to 2 TRRS Adapter, Splits 1 TRRS Phone/PC Jack into 2 TRRS Jacks for Headphone with Mic Compatible with iPhone, Samsung, PC, Mac, Rode SmartLav+ & Other 4-Pole
Tips for using the RØDE smartLav on iOS and Android - YouTube
RODE SmartLav+ Review - Best SmartPhone Microphone? - YouTube