Yes. you may continue to use your mobile number once the upgrade from 4G to 5G plan is completed.
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During the process of upgrading from 4G to 5G plan, you will be given a temporary number on your 5G physical SIM/eSIM.

You may continue using your existing physical SIM/eSIM until the temporary number on your 5G physical SIM/eSIM is replaced with your original mobile number.
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Number porting will take 1-3 working days. An additional 2 - 7 working days is required for the delivery of physical SIM (number porting will only commence after you have activated your SIM card).
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