The cost of making phone calls from your mobile can vary greatly from provider to provider and even from plan to plan. With increasing competition between phone providers, it is more important than ever to check the details of your price plan before signing up as not all types of numbers will be included in your price plan and this is where you can get stung.
On 02 for example 0800 numbers are free to call and will come out of your inclusive minutes whereas 0844 numbers will cost 55p per minute is you are on a Pay Monthly contract but only 45p per minute if you are on pay as you go.
Also, it is important to bear in mind that 02 will charge you a minimum charge of 1 minute for calling these numbers so if you make a couple of short calls you could end up with a bigger bill than you anticipated. With O2, calls to any business 0844 number is believed to cost from 35 pence per minute, plus a possible access charge.