Think of it like saying "Hello" in English. It's just a way to signal that you're ready to start a conversation.
Here are some ways to understand "Wai":
* "Hello": The closest equivalent in English, though not a direct translation.
* "Hey": More casual and informal.
* "Yes": This is an accurate meaning when responding to a call you were expecting.
* "I'm here": Conveying that you are ready to receive the call.
Ultimately, "Wai" is a phone-specific greeting that indicates you're ready to answer the call.