Copied from evilkaz, hope he deosn't mind :)
Neat little free app that lets you check for local versions of those pesky 0870 numbers. So that they come out of your remaining minutes.
Useful if your out and about and need a number. Worked for many numbers I've been after!
And its FREE ;-)
It works a lot nicer than the iPhone app, since Android gives you the ability to hook into the native applications already on the device.
Simple open the normal dialer, enter a number, hit call, and itll go off and get a new number if needed.
As far as I know, you cant post links to the Android Market - so, its on there under Tools. Or just search for 0870.