Why cats meow:
* Attention: Meows are a way for cats to communicate their needs and desires to humans, such as wanting food, water, or attention.
* Greeting: Cats may meow to greet you when you arrive home or when they want you to interact with them.
* Frustration: If a cat is feeling frustrated or bored, they may meow to try and get your attention.
* Playfulness: Some cats meow playfully, especially when they want to interact with you.
The "phone meow" is likely a coincidence:
While it might seem like your black cat is meowing more when you're on the phone, it's probably just a coincidence. Cats have their own routines and habits, and they might meow for any of the reasons listed above, regardless of whether you're talking on the phone.
Other factors:
* Your cat's personality: Some cats are naturally more vocal than others.
* The environment: Noises from the phone could potentially trigger a meow, but it's not necessarily a direct correlation.
Conclusion:
There's no scientific evidence to support the notion that black cats meow more when you're on the phone. It's more likely a coincidence or a combination of factors related to your cat's individual personality and the environment.