If you are using heavy mobile internet on 3G, you can get free 4G upgrade on Three UK mobile network. Three UK is rolling out their 4G service on December in 3 major cities in the United Kingdom. London, Manchester & Birmingham will get the first 4G service from Three UK network. Three customers on those 3 cities, get ready for faster internet on your phone.
Three will be the first mobile network in the UK to offer its customers a free 4G upgrade. There will be one more 4G service provider joining in the family of UK mobile networks. There are already 4G services operating from EE. Vodafone and O2 are launching their 4G services soon. Only Three was left behind with this 4G roll-out from their network.
Other networks are charging their customers a huge amount of money every month for a 4G deal. Three is offering a free 4G upgrade for all of its customers, without paying any extra. All the existing deals will be converted into 4G and you can enjoy their 4G service if you have a 4G ready device in hand. There is only one small software update necessary.
I guess Three will be the cheapest in the UK for 4G service as other networks price plan is so higher than Three. The only thing you need to use 4G on Three UK network just to have a 4G enabled handset. You will get the fastest internet, streaming music or movie, social networking & sharing and a lot more.
Three will cover 50 more cities in the UK by the end of 2014 and 98% of UK population by the end of 2015. I am using The One plan from Three UK, SIM only deal. Would love to get a 4G ready phone by the end of this year and hopefully it will be rocking.[Source]