To support multiple cellular & non cellular technologies there are several antennas present in smartphones today. To support high data rate of LTE standard of mobile communication there are two antennas, one for both transmit & receive and second one for receiving only.
Same is the case with antennas for Wi-Fi supporting latest standards like WLAN 802.11n & 802.11ac. Then there is an antenna for GPS and for 2G/3G bands.
For smartphones with NFC features has an antenna for the same.
