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Originally Posted by ishoot308

My AT&T phone supports both technologies according to this....

https://www.reviews.org/mobile/is-my-phone-gsm-or-cdma/

Dan

Many phones support(ed) both, if not most smart phones do these days.

Just because your phone has both doesn't mean your phone can use it, if your carrier doesn't use it.

Moot anyway

AT&T shut GSM down in 2017.
US Cellular shut CDMA down in March 2020

T-Mobile shutting GSM down in end of 2020.
Verizon shutting CDMA down in end of 2020.
Sprint shutting CDMA down in end of 2020.

I depended a lot on Verizon CDMA (US Cellular roaming around the lakes) filling in LTE gaps.