npaladin-2000
Senior member
- May 11, 2012
- 450
- 3
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Good luck getting the carriers to play nice with LTE bands. A lot of the phones released by carriers only with that carriers' specific bands. It costs money to certify/design more LTE bands, so there is some cost issue, but mostly greed.
Only exceptions would be manufacturers unwilling to bend to carrier modifications and only release one model with all bands (eg apple iPhone, google nexus)
There can be some overlap: I believe att/Verizon/T-Mobile hold and will use bands 2/4. T-Mobile's band 12 phones can roam on Att's sband 17. Sprint is just SOL,and I hope their new equipment policies will try to be more consumer friendly(yeah... Probably not going to happen)
Bands 2 and 4 (PCS and AWS) are pretty universal, Sprint even uses Band 2 in places, not Band 4 though (and they mostly use Band 25 rather than 2 anyway) . Once AT&T gets their 700 mhz stuff advertising as Band 12 that will also be a common band, also used by T-Mobile and US Cellular. Those three bands are where any LTE roaming is going to happen.
Verizon's Band 13, Sprint's bands 25, 26 and 41, and AT&T's bands 17 and 30 are all pretty unique to each carrier. AT&T also has LTE Band 5, which Verizon and Tmobile could theoretically use, but so far they aren't, and I don't know if US Cellular or cSpire are using it either.
Band 12 devices can only make use of a Band 17 LTE network if it's also advertising itself as Band 12, not if it's only appearing as Band 17. So it's not correct to say T-mobile Band 12 phones can use AT&T's current Band 17 network. They can't not until AT&T makes some changes to it to make it compatible.