GrandCentral offers many features that complement the phone services you already use. If you have multiple phone numbers (e.g., home, work, cell), you get one phone number that you can set to ring all, some, or none of your phones, based on who's calling. This way, your phone number is tied to you, and not your location or job. The service also gives you one central voice mailbox. You can listen to your voicemails online or from any phone, forward them to anybody, add the caller to your address book, block a caller as spam, and a lot more. You can even listen in on voicemail messages from your phone while they are being recorded, or switch a call from your cell phone to your desk phone and back again. All in all, you'll have a lot more control over your phones.