Android tablets don't have cellular antennas for making voice calls, so you can't set up a Global System for Mobiles or Code Division Multiple Access voice service on a tablet. With Wi-Fi or data network service, you can make Voice-Over-IP calls using a Bluetooth headset or a tablet's built-in microphone and speakers.
The Difference Between Smartphones and Tablets
Tablets and smartphones use the same low-power internal components, 32-bit processors, RAM and flash memory, but tablets use more battery power to light their larger LCD screens. Many Android tablets, such as the Nexus 7, HP Slate and Alldaymall, have built-in microphones and front-facing cameras for making VoIP video calls. Tablets compatible with 4G Internet have subscriber identity module card slots for connecting to Long-Term Evolution (LTE) networks. Since tablets don't have cellular antennas, however, inserting a GSM or CDMA SIM card into a tablet doesn't give it voice service, and unlike smartphones, tablets don't come with phone software for dialing numbers. However, tablets' larger screens make them ideal for voice chat and video calls, especially between several people.
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