Everything Everywhere to spark mobile phone call price war with T-Mobile cuts T-Mobile claims it will offer the cheapest unlimited mobile package in the UK when it rolls out its "The Full Monty" plan on February 1, offering customers who sign up for two years uncapped calls and data from £41 a month, or 2,000 minutes of calls and unlimited data from £36 a month. The price drop will force a strategy shake-up across the mobile sector, particularly at Three, which has rapidly gained market share by undercutting other providers" data packages and capitalising on the accelerating adoption of smartphones. The current cheapest, Three's £25-a-month "One Plan," for example, offers unlimited data and tethering, but caps cross-network calls at 2,000 minutes. Ben Fritsch, T-Mobile's head of propositions, said: "Over the past two years, we've seen a rise in mobile internet use of over 250pc, which reflects the consumer trend of being "always on" wherever they are. However, consumers also still want to retain a more personal level of communication by calling or sending a text. The Full Monty has been designed for customers who want the peace of mind that there are absolutely no limits placed on their allowances, while also knowing they're getting market leading value for money. However, T-Mobile's new tariffs are at odds with Everything Everywhere chief executive Olaf Swantee's declared ambition to boost margins at the company, rather than relentlessly pursue market share. It also contrasts with the company's controversial decision to increase tariffs at its other network, Orange, on the grounds that operating costs are increasing. Orange's 4.34pc price rise was the first in the network's history and sparked fury among Orange customers when it was announced in a text just before Christmas.