How to check that my Phone supports MicroSd Card SDXC UHS1 Bus Speed U30 card or not? My device manufacturer technical specifications say that Expandable storage supported is of 128GB FAT32 hope its slots must be supporting SDXC form factor not SDHC form factor and UHS1 U3 BUS SPEED

I want to purchase a card of 64GB or 128GB for my device and want to pre-confirm before purchasing 

I have readed  answer to the question  microsd Speed necessary that UHS  class U3 is not supported in all type of phones

and link of    Wikipedia: en.wikipedia.org/wiki/SD_card#BUS  
also say that  


  "Older host devices generally do not support newer card formats, and even when they might support the bus interface used by the card.."


and link of   Wikipedia: en.wikipedia.org/wiki/SD_card#Bus 
also say that  


  "Use of UHS requires that the host device command the card to drop from 3.3-volt to 1.8-volt operation and select the 4-bit transfer mode."


This all confused me  so I want to confirm with online and other site whether integrated sdcard reader / host controllers specification  but  nothing could be founded for android and specially for my device

I want to know will the Micro SD-Card slot/host controller  will able to detect SDXC UHS1 Bus speed class U3 cards or not and if detected can it perform on good speed or not?
If your phone specification state that it can support sd card &gt;32gb (recent phones have support like 128gb, 512gb, 1tb or 2tb), then it supports SDXC.
Otherwise if it only supports 32gb and below, it only supports SDHC since there are no SDHC cards that has greater than 32gb of storage.
Regardless of the UHS-1 class, your phone can still detect micro SD cards that is SDXC compatible since it only specifies the card speed, not the compatibility. At the moment, no phone supports UHS-2 cards (not to be confused with UHS-1 class 2 or U2) but you can still use it since it is backwards compatible - though, you will not gain the optimal speed of that card.
Hope this helps!