If you do not want to lead your group through your phone, you can easily lead it on your laptop or desktop computer. You can download the app ahead of time, install and test it, and know what will work best for you. You can use the built in camera if you are using a laptop, or take it up a notch and use a high-definition webcam while using a desktop. Most webcams come with microphones as well, though you may still want the freedom of movement and ease of use by using a pair or bluetooth headphones as your mic and speaker.
My preferred webcams: Logitech BRIO (what I use) or StreamCam
Notice that even though I stepped up to using a webcam for this video, some of the audio and video came in and out of focus and quality? This will happen, and a lot of the time it will be 100% completely out of your control. Things like weather, cable servicing, or the amount of people in your home who are using the internet will greatly affect your conference call quality.