Call disconnects exactly after 20 minutes

snehilraj wrote: "IPhone 12

15.1.1"

See if updating to the latest 15.3.1 helps:

About iOS 15 Updates - Apple Support

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Start by contact your carrier.

snehilraj Said:

"My call gets disconnected after 20minutes"

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Power Lost?:

How much battery percentage is left? The power may have gone dead.

snehilraj ~ What model of iPhone is it?...

Settings > General > About > Model Name

What version of iOS is it running?...

Settings > General > About > Software Version

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snehilraj wrote:

I got it delivered from Amazon.How can I connect with carrier?

You carrier is whoever provides your cellular service. Who to you pay your phone bill to?