It will roll out to 12 other cities including Manchester, Leeds and Sheffield by the end of the year, the firm said. Prices for customers will begin at £26 per month for a SIM only deal with a 12-month contract. Last week O2 announced plans to launch its own 4G service on the same day. O2's lowest tariff is also £26 per month. EE, the first network to offer the faster mobile internet service, has a base tariff of £21 per month. Three has said it plans to launch a fourth 4G network before the end of the year. Vodafone has partnered with the music service Spotify and TV channel Sky Sport for its launch, to offer additional content to its 4G customers. It is also providing unlimited data-use within the UK for the first three months of contracts, but otherwise imposes the maximum of an eight gigabyte cap. Vodafone said this would help customers pick the right data plan. Consumer groups have been critical about the fact that only Three has committed itself to offering unlimited data as a long-term option. Source: BBC News