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I understand that the colour of the signal indicator tells me whether or not I've got a connection to Google servers or not, but what is the "H" that sometimes pops up?

H

Usually my indicator says "3G":

3G

But, in addition to having an "H" now and again, sometimes it has no letters at all:

nothing

I assume this is telling something about what kind of data network I'm on, or not on, but what exactly is happening?

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2  
I think H stands for HSDPA en.wikipedia.org/wiki/High-Speed_Downlink_Packet_Access. – Propeller Jul 11 '12 at 4:30

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up vote 10 down vote accepted

It's HSDPA which if I'm not mistaken is referring to 3.5G.

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and you're using Cyanogenmod -- plain old Android doesn't display an H, at least mine doesn't. – offby1 Jul 11 '12 at 5:22
2  
Actually, it does. Seems to depend on version. – Chris Stratton Jul 11 '12 at 5:25
@offby1 From my experience I have seen H since the first day I bought my first Android device, which was HTC Hero GSM. – Rashidi Zin Jul 11 '12 at 5:38
3  
To be accurate, it means HSPA, which includes HSDPA (download) and HSUPA (upload). Also, if there is no letter, it means there's no data connection or it's trying to connect to one. – onik♦ Jul 11 '12 at 9:25

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