Samsung — 5G phone 4G sim

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By the way I have been hearing from people for some time that I have taken a new phone to see that it is a 5G phone
Hey tell me that if the phone is 5g then how is it able to run your 4G sim properly
When 4G SIM did not work in 3G phones then 4G SIM and 4G phones had to be taken.
Nothing is 5g The new phone is being sold by simply speaking 5G
By the way I ask the owner
IPHONE
SAMSUNG
VIVO
OPPO
XIAOMI
TECNO
GOOGLE
of these company that if you have a diesel car then you will not get the petrol
Till 5g sim has not come in the market, how did you launch 5g phone in market
Neither does anyone know whether the 5G SIM will work in that phone or not because the company has used the SIM from an angle, using the 5G SIM
Will work better because you did not have a 5g sim