Cell Phones Standards - 4G LTE, GSM, and CDMA Question

I'm curious about 4G LTE. As I understand it, 4G LTE is a GSM standard and not a CDMA standard. With the advent of 4G LTE, are the CDMA carriers (Verizon, Sprint...) going to migrate away from CDMA and toward GSM. Or, is there 4G technology that rides on top of CDMA?
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What you are thinking about are the various methods to transfer a phone call or data over the air.  These methods have been standardized so that we have compatibility.  Just like bluray or VHS it means that when you travel else where in the world your phone will work because there is a standard to follow.

Very very generally there are two major standards (by generally I mean that there are not only these two. China TDSCDMA and Japan for example have other popular ones) these are the CDMA2000 standard which you are thinking about and widely used in North America.  There is the GSM standard which is a European standard and used in most of the world.

The GSM Standard has evolved from GSM - GPRS - EDGE - WCDMA - LTE - The marketing people around the world of course like to try and make it something different and thus you get 2G(GSM) 2.5G(EDGE) 3G(WCDMA) and now 4G(LTE).

CDMA2000 also has similar steps to keep up with GSM.  

You cannot use a GSM ONLY phone for CDMA2000.  Some phones might be dual use phones and do both.

If you are in the US and dont plan to ever use it overseas then you can choose between them.  If you want to come to Europe with your CDMA2000 phone then you will have a problem.  You need to see what your provider is offering you for this case.

The standard that works in most countries of the world is GSM.
To directly answer your questions in the light of the above.

With the advent of 4G LTE, are the CDMA carriers (Verizon, Sprint...) going to migrate away from CDMA and toward GSM

Lets say this the other way around - I dont know of a CDMA Carrier that has said it will be continuing with CDMA200 - UMB Ultra Mobile Broadband which is the same as 4G LTE.

Most likely they will migrate to GSM and LTE or WiMax.

Or, is there 4G technology that rides on top of CDMA?

There was or would have been UMB Ultra Mobile Broadband - but Qualcomm has already said it would not be developing it any further.

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jdanaAuthor Commented:
Excellent responses. Thanks!
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