Does my Personal Post^TM E700 Series Postage Meter need to be connected to a phone line at all times?

No. Your meter only needs to be connected to a phone line when you want to perform a Postage Refill.  

You may also be interested in these related articles:

> No dial tone during the refill process
> The Ready feature will not display
> Error Message - Inspection Due/Inspection Required
> Clearing a blank screen
> Resetting your meter
> Inoperable meter
> Turning your meter on and off