Within your Phantom wallet, you'll find that each account has several associated addresses depending on your "Active networks" settings.
Viewing Receive Addresses On Desktop
You can view all of the addresses associated with your account for receiving digital assets by hovering over your account name on the main wallet screen.
You can also view them by clicking on the menu icon located in the top-left corner of your primary Phantom wallet screen and hovering over your account. From there, clicking on the network for which you would like to copy the receive address for will copy it to your clipboard.
Viewing Receive Addresses On Mobile
On mobile, receive addresses can be viewed by tapping on the QR code icon in the top right of your mobile Phantom wallet. Tapping the desired network will copy your receiving address to your clipboard.
You can also find your addresses when going into the settings of your mobile Phantom wallet, entering your current account which will be at the top of the menu, and the tapping on "Account Addresses." Once again, tapping on the desired network will copy your receiving address to your clipboard.