EE also announced that some customers will see an increase in the price of some other charges. For example, the mobile operator is raising the overage rate tacked on to an account that exceeds monthly caps on voice calls, and text messages. Rates are also going up on calls to 08 numbers, international calls, and MMS. The carrier even has a calculator on its website, programmed to increase your rate plan by the 2.7% increase, so that you can compute your new monthly fee.
If you have a plan with the top rate of £74.99 a month ($124.32 USD), the increase is just £1.99 a month ($3.30 USD). EE customers haven't received notification yet of the price increase, but a text from the carrier should soon arrive.
If you joined or upgraded after the 23rd January 2014 then you are not affected by the price increase. If you have upgraded to a new contract in the last 30 days you may still receive a letter, however the price increase is not applicable to your new plan.
For some customers, we are also making changes to a number of other charges such as standard UK calls and texts when you go over your mobile allowance, and other services like calls to 08 numbers, international calls and MMS. These changes will take effect from the 28th May."-EE
source: EE via WPCentral