Are 3G/4G/5G cell tower finders useful for urban climbing?

Hello everyone, I’m completely new to urban climbing and I’m trying to understand how to find greats spots to climb.
For some context, I live in Lyon, France and I found this 3G 4G and 5G cell tower finder on the App Store and I was wondering if these are any good for finding great climbing spots.
Also, any tips for literally anything related to this would greatly help and be greatly appreciated.
Thank you