Nokia Lumia 2520 tablet used as mobile with sim?

How can I use my Nokia Lumia 2520 tablet as mobile phone with a separate sim? I swicth off my mobile, activate the mobile connection on the tablet but

How can I use my Nokia Lumia 2520 tablet as mobile phone with a separate sim? I swicth off my mobile, activate the mobile connection on the tablet but cannot receive incoming calls.

or:How can I use my Nokia Lumia 2520 tablet as mobile phone with a separate sim? I swicth off my mobile, activate the mobile connection on the tablet but cannot receive incoming calls.

or:sorry to dissapoint but you can not make phone calls or send/receive sms. you can use the cellular capability to connect on skype for example but you can not use it as a phone

or:Ahhh!!! Then what is the purpose to provide SIM on the tablet when they cannot give access to calling facility?

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