How To Use 4g Sim In 3g Android Mobile Phones

How To Use 4g Sim In 3g Android Mobile Phones :

1. Open dialer and enter this Ussd code *#*#4636#*#* to open engineering mode.
2. Click on Phone Information.
3. Scroll down and select “Set Preferred Network Type” >> Then select “LTE/WCDMA/GSM auto” Option.
Done !

You get 4g signal in 1st slot.
You could use 4g Sim now without any restrictions..

( *If your device doesn't support the above secret code then you need to download the mtk engineering mode app from Playstore*)

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