how to enable only 4g jn my phone

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Deal Newbie
asing

I have samsung f40 and vi sim and  ##3646##not working  in my samsung phone to put my phone setting only in 4g band like jio .
Pls help because while using internet my 4g change to 2g automatically for few seconds.

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Blaze Blaze
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Try star#star#4636#star# star

Deal Newbie Deal Newbie
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Not working in samsung

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Like Magnet Like Magnet
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@asing i think problem is with Vi not in your phone. Try with airtel or jio sim.
P.s – is VoLTE icon showing near network bar?

Deal Newbie Deal Newbie
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Yes bolte is showing

Deal Subedar Deal Subedar
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Not supported natively.. Have to use third party software..

Download True caller and then dial the code in its dialer..( go ogling result)

Deal Newbie Deal Newbie
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In true caller also not work after dailing code it push back to home

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