Unfortunately, adding the leading "1" was how I'd entered it initially (because that's what was displayed on the caller ID), but calls came through anyhow, hence me dropping it and just using the 10 digits.
So, I have the "Home & Away" service. I configured it using the online managemet page to block a number, but in the last 3 days I've had the phone ring no fewer than five (5) times with this number: 877-866-8880 I've answered calls from this number m...