Please see this page for details.
So why do idMobile require “30 days cancellation notice”?
Isn’t this now unlawful?
Best answer by Ryan
The notice period changes by Ofcom relate solely to when you’re switching to a new provider. If you are leaving us for a new network then you can supply that network with a PAC code to move your number to them, or a STAC code to move whilst not taking your number with you. The use of either code will cancel the iD Mobile plan without the need for a notice period.
Ordinary notice periods where you are not moving to a new network are still applicable though, so it’s advisable to use a PAC or a STAC code if you are leaving us for a different network to avoid any notice of cancellation periods.
The article mentions “Customers need to give their new provider the PAC or STAC number, so their old and new mobile companies can make sure there is no double payment.” which covers this point.
I hope this helps.