EE are increasing their prices above the RPI allowing you to leave penalty free.
I raised on the EE forum after stumbling over an increase:-https://community.ee.co.uk/t5/Landline-phones/Notification-of-Price-Increases-January-Price-rise/m-p/508854#M388
Not many helpful replies but 'starry' saved the day:-
'I received an e-mail today about the price increases for January...
The price of your line rental will increase by £1.75 a month
The price of calls you make from your landline that are outside of your plan allowance is changing; our call connection fee to UK landlines and mobiles will increase from 17p to 20p
There are also changes to other call rates
Then the normal rubbish blurb......
We try to keep price rises to a minimum, but in order to continue to invest in the service that we provide, we need to make this price increase. We appreciate that the price increase does change the amount you spend with EE each month. So if you would like to discuss your options or cancel your contract without charge please call us by 16 December 2016 on 0800 079 0177'