How to Fix No SIM Found, Invalid SIM, Or SIM Card Failure Error on Android

Follow this easy methods if your phone Stopped getting signal
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[@GallonOfMilk3]

yo how can i fix on nokia 6.4 having black screen i once put it charging at night when i woke up it had less % now when it tries to charge and turn on it wont

[@kartthneebalakrishnan]

THANK YOU BROTHERRR

[@user-qu5uk5oo6m]

THE SLOT HAS BEEN LOCKED,WHEN SIM WILLE BE INSERT IN SIM SLOT, THEN FACES PROBLEM (THE SLOT HAS BEEN LOCKED).
HOW WILL BE SOLVE IT.
PLS, SEND ME SOLUTION