Freephone numbers are to become free from mobiles under a major overhaul to make telephone call charges and dialling codes clearer, regulator Ofcom has confirmed.
The telecoms watchdog said from June 2015, "freephone will mean free" for 0800, 0808 and 116 numbers, which are currently free only from landlines and cost mobile phone users between 14p and 40p a minute.
It also announced measures to tackle "consumer confusion" over how much it costs to call companies and organisations such as government agencies and charities on non-geographic numbers - those beginning with 08, 09 and 118.
Unless using a BT line, callers are not informed about how much these numbers cost.
But Ofcom's new rules will mean they have to be broken down into access charges, to be made clear by phone companies, and service charges that must be specified by the organisation being contacted.
This will mark an end to warnings on adverts that "calls may vary from other landlines and calls from mobiles may cost considerably more".
Ofcom said the new rules will also see premium rate call charges - to 09 numbers - capped to protect consumers from rogue operators imposing extremely high charges.
"We expect them to restore people's confidence in using phone services, and to increase competition."
Confusion will also be addressed around 0845 numbers, which can cost up to 11p a minute from landlines and 41p a minute from mobiles.
This new rule will mean 0845 will work like any other 084, 087 or 09 number, with the calling cost broken out into access and service charges.
The rules will not come into effect until June 26 2015 to allow companies and service providers to make the changes.
A nationwide communications campaign will launch next year to explain the call charge changes.