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Hi
I don't know are you fully right about other brands top bar icons as on Samsungs and other phones which I was using I was always getting extra icon when I switching on data (on Samsungs I was getting LTE sign).
As I mentioned before the main "big" sign is showing to you in which band you are currently as this will give you information about quality of voice calls and data transfer speed. If you get only signal status in bars you will know how strong is signal but you will never know in which band.
In the previous generation phones there was no need getting this information as every voice call was made by 2G band and 3G was only for data.
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