For most recordings, you should be able to skip the headphones and simply hold the iPhone as if you were talking on it as usual.
Maka ọtụtụ ihe, ị ga-enwe ike ịkụnye ekweisi ma jidekwa iPhone dị ka a ga-asị na ị na-ekwu okwu na ya dị ka ọ dị na mbụ.