H' stands for HSPDA (High Speed
Downlink Packet Access) higher
version of 3G, the speed in this is at
least 7.2 mbps or higher. This mode
permits you to enjoy the power of
internet surfing/downloading or
uploading. There is an exception in
both 3G and H, a few of persons
says that 3G is more powerful than
H.
Let's have a look what these symbols
say:
G = 1G (GPRS)
E = EDGE (2.5G)
3G =3G
H (High Speed Downlink Packet
Access) = 3.5G (HSPA+), HSPA 14.4
(really just a 3G standard, marketed
as 4G)
4G=4G
In order of speed: 4G > H > 3G > E
If the signal indicator says H, it
won't also say 4G unless the phone
is capable of LTE, which this phone
is not