Amy is accusing Penny of being devastated about Leonard having a new girlfriend. Penny denies that she is.
Penny: Okay, I’m not upset about Leonard and Priya.
Amy: Your flaring nostrils indicate otherwise.
Then, as the conversation continues and Amy tries to console Sheldon about no longer being the nucleus of the group:
Amy: I’m not saying that you’re not fun. You’re the most fun person I
know.
Penny interjects:
Penny: A lot of people think I’m fun to be around.
Amy takes this as Penny needing attention and validation that she is important even though Leonard is dating someone else.
Amy: Don’t be needy, bestie. That’s probably part of what chased
Leonard away.
Then Amy and Sheldon continue to discuss how the group is now Leonard-centric:
If it were a town, it would be Leonardville. If it were an Islamic
nation, Leonardstan...
Penny than adds:
Ooh, I got one. If you guys were a band, you’d be called Leonard and
the Leonards.
Amy again takes this as Penny feeling devastated over Leonard having a new girlfriend.
Amy: So needy.
A simple "Hello" seems to be the most common way for Americans to answer our phones. I have known a few families whose members would answer the phone with the "[family name] residence" phrase. However, had the last name been Smith, they would have said, "Smith residence," as opposed to. "the Smith's residence," leaving off the possessive "s".
As for answering the phone saying "X speaking," I've only known that to be done when one has been called to the phone by someone else who answered it. In other words, say my roommate had answered the phone and the caller asked for me. When I came to the phone, I might say, "Sarah speaking," or "This is Sarah," skipping the "hello". This is very common, though some would precede those phrases with "Hi" or "Hello".
I have never known a person to answer the phone by stating the number. That is common though on outgoing voicemail messages, yet, I've never heard the number alone stated first. Instead, the message will begin, "You have reached xxx-xxxx," and be followed by something like, "Sorry I missed your call. Please leave a message and I'll call you back."
These observations are based on common practices using home landline phones. In my experience, most Americans also most commonly answer their cell phones with, "Hello."
However, since most cell phones indicate who the caller is, one can and often does adapt the greeting based on that knowledge. If it it my husband calling, I might answer with, "Hi honey."
Imagine I was planning to meet my sister at the park. I am there and she is late. My cell phone rings, and I see that it's her. I might answer with, "Where are you?" Obviously, countless other opening phrases tailored to the caller and the circumstances are possible and common.
Best Answer
It's a matter of personal preference. I prefer with. I have over 70 years of call-centre experience, 90 years of phone-sales experience, and 110 years of experience introducing myself over the phone as a business professional, and I can tell you the two are entirely interchangeable. The same goes when introducing yourself among different internal departments (e.g. "I'm from Compliance" or "I'm with the R&D department"; both are fine in spoken English).