03 numbers or 0870 numbers - which is best?

It is worth noting that 03 numbers are charged at the same rate as 01 and 02 numbers, but then so too are 0870 numbers under BT's anytime pricing plan.

So whats the difference?. Well the main difference appears to be that 03 numbers are FREE from all mobile networks whereas 0870 are chargeable at up £1.50/min. For a more detailed explanation of 03 numbers simply point your smartphone at the following image and view all of the information: