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Hi @NaveenJanaa Welcome to the Samsung community
it is a read error which results after porting and there is currently no software fix. However it does not effect functionality and is not really much of an issue.
some have found a way round it by borrowing an iphone and inserting sim ( not ideal I know 
would need to go to Settings-phone- My Number and edit it to the ported number.
once putting sim back into Samsung phone should display correct number.
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
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