Telefónica O2 is currently trialing LTE in Slough, UK. O2 has deployed six 4G mobile cell towers  and are capable of handling the same volume of traffic as O2's entire UK 3G network.

As per O2 blog, O2 COO Derek McManus Derek supports the necessity of O2's data usage policy and more specifically the use of caps, highlighting that the days of unlimited data usage were over for the mobile industry.

Here's a video from January last year, but it shows what it achievable with 4G speeds.

For the vast majority of the 22 million, O2's 3G customers, the service works brilliantly. Data caps is something that affects a 3 per cent minority of O2 customers but the company remains committed to servicing them as it does its other 21 million or so customers.

It took almost 10 years to get 3G from a concept to the vast majority of the country and still investment continues (to the tune of about £1 million per day across the country) on the current 2G and 3G network, to improve performance and increase capacity, blog explains.