EE and O2 mobile phone customers will see their monthly mobile phone bills increase in the coming months, the UK carriers have warned.
The latest wave of price hikes is set to affect millions of customers on pay monthly and sim-only plans.
Both mobile firms have announced increases, with EE planning to increase its prices in March and O2 to follow in April.
These latest price hikes are related to inflation, the mobile carriers have confirmed.
Telecom companies are permitted to impose price rises mid-contract thanks to a clause in the terms and conditions.
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The small print lets carriers increase prices in line with the Retail Prices Index (RPI) – the measure of inflation published by the Office of National Statistics.
It is currently set at 2.5 per cent.
Retail Prices Index is a measure of the change in prices for consumers on average across the country over the last 12 months.
O2 claims it has always allowed for annual increases in line with inflation, while EE told new customers that annual price hikes were a possibility since March 26th 2014.
EE includes some examples of the new pricing structure in its correspondence
"We’re getting in touch to let you know about the Retail Price Index (RPI) change to your monthly price plan(s), which will take effect from 30th March 2017," the email from EE tells customers.
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"Any bills you receive from 30th March 2017 will show a 2.5% increase in the monthly price of your plan(s)."
For example, those who pay £14.99 a month will see a 37p increase on EE, and those who pay £34.99 a month will see bills increase 87p.
Meanwhile, O2 is preparing to increase monthly payments for all pay-monthly and sim-only customers by 2.6 per cent in April 2017.
So expect to see similar increases as those on EE.
O2 has also hiked its monthly mobile plans, thanks to the chance in the Retail Prices Index (RPI)
The latest price rise will not affect pay-as-you-go customers on either network.
Express.co.uk approached both EE and O2 for comment on the price rises coming to mobile customers in the coming weeks.
A spokesperson for EE said: "As the UK’s biggest and fastest mobile network we work hard to offer our customers great value. Like many service providers, our Pay Monthly plans increase by RPI annually.
"This year our customers will see a typical rise of less than 80p a month. We’re currently contacting our customers to remind them this will take effect from 30th March 2017."
Meanwhile, a spokesperson for O2 said: "Our annual RPI adjustment this year is 2.6%. Some other companies offering communication services have increased their monthly rentals by up to 9%.
"Other operators apply their RPI changes to the total tariff which includes the handset cost, while our O2 Refresh customers only see the rate added to their Airtime Plan and not the Device Plan.
"This adjustment means an extra charge of 46 pence per month for customers on our most popular tariff and we’ll be contacting customers next week to let them know the change will be reflected from their April bill.
"We’ll continue to invest in our network and the services that matter to our customers while still offering great value for money."