Sometimes there's an E, sometimes an H and sometimes a G. What do they each mean?
G = 2G
E = Edge (think 2.5G)
3G I'll let you guess
H = HSDPA (high-speed download packet access) 3.5G - also labeled as 3G+ in some phone releases (Orange f'rinstance).
That's them in order of speed, low to high.
what does orange a b c mean
Where are you seeing these? And do you mean that they are coloured Orange, or that you are using an Orange branded phone?
Separate names with a comma.