On every EE contract the monthly price plan charge will be increased by RPI in March of each year. Other prices, such as call charges and Roaming costs, may also go up during your plan. Your first annual RPI increase will take place in March 2019.
Biggest 4G coverage: 95.23% 4G population coverage as at 31st Jan 2016, EE data.
4G speeds & coverage vary depending on location & number of users. See ee.co.uk for more.