To answer that requires more information. What brand tablet is it? Even tablets that have SIM cards and can use mobile data do not actually have call capability like a cell phone. However, any tablet with internet connection, either by wifi or mobile data, can make and receive calls, texts, and even video calls, using an app such as Skype, Viber, Google Hangouts, or even Facebook Messenger. When you use an app like that you make and answer calls using the app. I have not used Facebook Messenger for calling, but I have used the others. All are available for Windows or Android.
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To answer that requires more information. What brand tablet is it? Even tablets that have SIM cards and can use mobile data do not actually have call capability like a cell phone. However, any tablet with internet connection, either by wifi or mobile data, can make and receive calls, texts, and even video calls, using an app such as Skype, Viber, Google Hangouts, or even Facebook Messenger. When you use an app like that you make and answer calls using the app. I have not used Facebook Messenger for calling, but I have used the others. All are available for Windows or Android.