Once activated, the Call Grabber feature provides the ability to move calls between your mobile phone and desk phone without the need to "transfer" the call.  By dialing a dedicated Call Grabber telephone number from your mobile phone, you can "grab" the call from your desk phone without the caller being aware that the call has been moved.  This can come in handy if you want to finish a call while running to your next meeting.  Upon returning to your office, you can dial a code on your desk phone and "grab" a call from your mobile phone to your desk phone to continue the conversation.  This feature does not require the use of a VoIP mobile client.