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A1 pro is supporting LTE bands but only is not showing LTE icon because LTE is part of 4th network generation. Currently you can get various 4G types {different speed.
4G:TDD-LTE 38/40/41
4G:FDD-LTE 1/2/3/4/5/7/8/12/17/19/20
SoC is also important for downloading/uploading speed. Unfortunately this phone is budget phone and you cannot expect high end specifications but please look here at my screenshot.
There is always network type icon because is indicating in which network generation you are, another small icon is only on when you have activated mobile data and if you currently using mobile data. So as example: you have activated mobile data and set Wi-Fi, because Wi-Fi has always priority the small network generation icon disappearing because phone is not using mobile data, when you switch off Wi-Fi or you will be out the Wi-Fi range phone will automatically swap too mobile data and icon will come back.
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