Quote from Chandler in The One with the Evil Orthodontist
Chandler: [uses Monica's phone to call his phone] Yes, it's working. Why isn't she calling me back? Joey: Maybe she never got your message. Phoebe: You know, if you want, you could call her machine, and if she has a lot of beeps that means she didn't get her messages yet. Chandler: Doesn't that make me seem a little- Ross: Desperate? Needy? Pathetic? Chandler: Ah, you obviously saw my personal ad.