You will be get it soon maybe in few days in this month. If you like please accept as a solution it's help to others users also, click on 3dots in my reply section and click on accept solution. Thanks.
As per Samsung's schedule notification sent to all S21 should get one UI 7.0 in May 2025. Keep checking and be patient. Many have received. You receiving update is also carrier ie.,Jio,Airtel,VI,BSNL. dependent. Hence some get early and others a bit late.
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