Updated for Windows Phone 7.5 (Mango)!
Many businesses in the UK use numbers beginning with 0870, 0845 & 0800 which usually costs a lot to call from a mobile or even a land line.
NO870 will convert these expensive numbers into 01, 02 or cheaper 08 numbers. Placing calls to these number will be deducted from your contracted minutes by your service provider.
In short, this application will save you money on your phone bill!