antenna would make sense - since most mobile phones are build some kind of clustered - the contacts on the pcb should led to the point of origina - and i gues it has something to do with the features of the phone:
Cellular Networks: GSM850, GSM900, GSM1800, GSM1900, UMTS850, UMTS900, UMTS1900, UMTS2100
Cellular+Data Links: CSD, GPRS, EDGE, UMTS, HSDPA, HSUPA
Bluetooth: Bluetooth 3.0
Wireless LAN: 802.11b, 802.11g, 802.11n
and of course AGPS
to get this all managed, you need antennas - and you need more than one for that ;-)