Quote:
Originally Posted by Quoth
Nokia was making multi-region/mulitband phones before Apple or Google made any phones. But Apple's first iPhone was CDMA or GSM, thus USA model didn't work elsewhere and Europe model didn't work in USA, though the Europe Nokia models might only have worked on USA non-CDMA operators (there was GSM and 3G in USA too in 2007)
Historically CDMA in USA was the awkward one as it didn't use a SIM (not even like modern Apple promoted eSIM) and was completely different. It's gone. Also USA GSM and Europe GSM used different bands in 2007.
There is now considerable overlap even without a phone having multiple country specific bands as the old Nokia phones had. When the Apple iPhone first arrived in Europe it had GSM (900 & 1800 MHz back then, much has migrated to 3G/UMTS or 4G) but no 3G (then 2100 MHz only).
Some countries in Europe have replaced 3G/UMTS with 4G, but kept some 900 MHz GSM (smart meters, but works on phones). The 1800 went from GSM -> 3G -> 4G.
The 5G is mostly irrelevant except in stadiums, racecourses etc.
So since demise of CDMA (USA 2G) and much GSM (Europe 2G) and most 3G, most phones work worldwide. or the same model is used worldwide, but enabled feature change per operator
The available WiFi channels will vary with what region you set it to.
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There wasn't a CDMA iPhone until the iPhone 4. iPhone was exclusive to AT&T in the U.S for a few years which used GSM.