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Re:Plan Ahead for Phase Out of 3G Cellular Networks and Service by dathinab on Friday December 10, 2021 @09:00AM (#29509897)
I think it's also about:

- later recycling frequencies

- reducing maintenance burden (by not maintaining 3G)

- as far as I remember 3G as serious security vulnerabilities

Also most smart phones only a lifetime of 3-5 years at most, and even then people tend to replace them early due to braking them and for vanity.

So there are probably not too many smart phones around which do not support 4G and which are not a security liability. Through probably a bunch of fallback feature phones or other "less common" (then smartphones) kinds of phones.

Also it differs by country.

Re:Plan Ahead for Phase Out of 3G Cellular Networks and Service by CountSessine on Friday December 10, 2021 @11:08AM (#29511501)
later recycling frequencies

Yeah this is what I would think. My understanding is that in North America a lot of plum 800MHz bands are currently occupied by 3G umts.

edit - yes, both Verizon and AT&T are dedicating a single band of 850MHz spectrum for umts. So this would let them move that to 4G or 5G.