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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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marked as duplicate by Dan Hulme, Flow Apr 3 at 20:27

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3  
I think H stands for HSDPA en.wikipedia.org/wiki/High-Speed_Downlink_Packet_Access. –  Propeller Jul 11 '12 at 4:30

2 Answers 2

up vote 16 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
4  
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
4  
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
    
or you're on wifi. –  ChromoZoneX Apr 3 at 16:54

Let's state all the possible letters in the signal indicator, in descending speed:

  • H = either HSDPA (3.5G) or HSPA+ (3.95G), depending on your network provider
  • 3G = UMTS (3G)
  • E = EDGE (2.5G)
  • G = GPRS (2G)
  • (no letter) = voice only, no data connection

and also:

  • R = roaming (this means you're not on your home network)
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