Hey there GabrialStark,
I'm sorry to hear your phone is having trouble seeing the Chromecast! I'd be happy to help you out, since I know these issues can be difficult to troubleshoot on your own. Let me just ask you a few questions to better understand what's happening:
Depending on the color of the LED light on the Chromecast, and if other devices can see the Chromecast, we can try a few things.
I look forward to your response, and if you have any other questions or concerns for me, please let me know!