on 11-02-2015 19:44
Have a look at the numbers on your present sim. If it doesn't state 4G then you need to change.
on 11-02-2015 19:46
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone 8+ (EE)
on 11-02-2015 20:15
Possibly on the same training courses
on 12-02-2015 09:49
You can upgrade at anytime, the choice is yours and your present contract just rolls on month by month.