I can’t access to my Cam

I can’t access to my Cam from my phone outside of my house. Help.

It only works in my house when I’m connected to the Wi-Fi network.

Are you using a Xfinity XB7 . Long read: Short version is if you have an XB7 get a XB8 or purchase your own router.
I forgot to add, make sure you give the WYZE app permission to use Cell Data on your device.