Hi Caylin, my name is Alvaro and I'll be glad to help you today.
I understand that your phone's camera is the current default camera that your Teams uses whenever you join a call.
To select the camera you want Teams to use for calls and meetings, select Settings and more Select to see more options next to your profile picture at the top of Teams and then choose Settings > Devices. Under Camera, select the camera you want Teams to use, and see a preview of that camera's video.
If you have multiple certified devices connected to your computer, you can set one as your secondary ringer, which means it'll ring when a call comes in. Answer incoming calls on any device—not just the ones that ring.
For more information about the camera configuration on your Teams, please refer to this complete article
https://support.microsoft.com/en-us/office/mana....
If you have other questions, please let me know. Have a nice day!