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Re: [opensource-62] mobile network question

From: John F.
Sent on: Sunday, July 14, 2013 4:07 PM
Whoops, I missed this one.

Indeed CDMA and GSM are different, competing standards.  Verizon and Sprint used CDMA(PCS) for their network, and AT&T,T-Mobile, and the REST OF THE WORLD used GSM.  If a device says it has both... run.

All phone standards before LTE acted like they had data grafted on after voice stuff was worked out.  So as the data speeds increased (with new technologies) the standard way that calls were handled NEVER changed over the years.  Nitpickers will say changed codecs increased call capacity 4 and 8 fold per tower, with lower voice quality as a result, but it was still GSM (for example).

The "G"s in 2G, 3G, 4G are arbitrary marketing speak as they are used.  They give you a feel for the speed you should feel on the handset. Feel me?  There is an actual minimum definition of 4G by the ITU that is largely ignored in the media/marketplace.

So knowing what technology is used will just give you a range of possible speeds. If the tower you are on has that same tech, and it is tweaked properly, then you can get good speeds.  Or if you are in a cell that has it but is far away...  Or you have to fall back to an older and slower tech...

Wikipedia 3G and 4G, they have a great set of pages that use all the buzzwords.



On 07/14/[masked]:44 PM, Joel wrote:
I am not an expert anymore, but I would say it was not misleading. My understanding is that CDMA is not GSM.


On Thu, Jul 11, 2013 at 2:18 PM, mowgli <[address removed]> wrote:
if a phone has the following description is it misleading if it doesnt really get gsm 3G or am i just dumb?  i guess both is a possible permutation too.

3G: WCDMA
Business class data: GPRS, GSM, HSPA+

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