I have LG V20 (H990DS), it's global market's phone. Also there are AT&T, Sprint, Verizon. And I noticed that all models have different frequency bands. Is that mean that my phone will work better around the world and others are fixed to certain regions? If yes, other phones can be unlocked by rooting or something like that to work the same as "Global" phone?
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.... my phone will work better around the world and others are fixed to certain regions?
In theory, yes. That's the purpose of a global phone (also called international phone)
....other phones can be unlocked by rooting or something like that to work the same as "Global" phone?
No, since it requires changes at hardware (modem) and corresponding drivers. You can't change hardware by rooting

beeshyams
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Thank you for the clear answer, I noticed that H990DS has 16 4G bands and H990N (of Hong Kong) has 15. Does it mean that 4G will work in higher coverage in China on H990N than my H990DS? – Pranciskus Feb 28 '20 at 15:34
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1Maybe is better to count how many bands phone supports and check if it works in native country. European variant with 17 bands would probably be even better than global with 16. – Pranciskus Feb 28 '20 at 16:01
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Let us continue this discussion in chat. – Pranciskus Feb 28 '20 at 16:13
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@beeshyams It could be useful to keep in mind that some OEMs (e.g. Samsung) allow for carriers to only preload some apps, instead of locking the device altogether - in that case, the phone might be usable internationally. – Grimoire Mar 04 '20 at 02:52
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@DeathMaskSalesman- Thanks, yes, useful. I wasn't aware – beeshyams Mar 04 '20 at 04:49