How to avoid expensive calls to 0870 numbers

The website http://www.saynoto0870.com/ is a useful resource in the UK if you are looking for a lower cost, or even free, way to contact companies such as Virgin Media or Dell where an expensive 0870 call make be needed.  I get infuriated when big companies keep me waiting on an expensive call saying things like, "your call is important to us" then waste the next several minutes with drivel.

Most of these alternative numbers get in "via the back door" and work on the assumption that you will be transferred internally to the correct department. It may not always work, but if you want to save a few pounds it is worth a go.