Pretty much everyone uses CDMA these days. 3G/UMTS and 4G/LTE are both based on CDMA, which transmits continuously, unlike 2G/GSM/EDGE, which transmits in pulses and makes the dit-dit-dit-bzzz sound in nearby speakers.

Edit: actually LTE uses OFDM, which is mathematically distinct from CDMA, but a naive receiver is unlikely to notice the difference.

"CDMA" means something different than "code division multiple access" multiplexing when contrasted with GSM.

Instead it refers to the CDMA2000 family of telephony protocols (https://en.wikipedia.org/wiki/CDMA2000), which are a series of whole stack (radio modulation all the way up to text encoding schemes) protocols. Calling it "CDMA" is a branding thing than rather than having anything to do with multiplexing.

Why would CDMA and GSM operating in the same frequency result in different outcomes. It doesn't seem like there should be anything biologically significant by way of difference there.

I was always more comfortable with CDMA than GSM, partly because the speakers near a GSM phone can pick up on the GSM transmission code, what code is being sent, the duration sent, and the time in between transmissions. It was literally like hearing the morse code.

I immediately correlated the electromagnetic feelings in my body to this signal. And never trusted GSM phones again.

> electromagnetic feelings

What do you mean by this? And also, I'm sure I won't be the only one to point out the lack of a link between correlation and causation.

Give Verizon another reason to raise my rates... GREAT!