Phone dial icon is not visible in my samsung galaxy tab 4

Hi Friends,

I purchased a manufacturer refurbished samsung galaxy tab 4 8 inches unlocked version and I got it today, inserted my GSM lycamobile sim card, able to see network signals, able to access internet, but not able to make calls and receive as the Phone dial icon is missing and not available. Please help me how to get the phone dial icon and make calls from my tab.

Please help me on this.

Thanks and Regards,
Venkat

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