Answer to: Where is cellular antenna connectorI fixed this on my iPhone by taking a short piece of earphone cable (thin and flexible), soldering it to the point on the motherboard where that copper piece used to be, and the other end to the little copper aerial piece on the dock connector (on that image it is the little copper pin to the bottom left of the battery power connectors). Worked for me :)
Answer to: Where is cellular antenna connectorah, mine is missing, probably where the last owner did as you said! Do you know where I can find this part, or if there is a work around?
Answer to: Where is cellular antenna connectorHaving a very similar issue and realising that the next place to look is the mainboard to antennae connector, it is just below the battery power connector (towards dock) and appears to connect to the metal ring around the glass of the phone and through to the antennae on located on the back of the dock connector. Anyone is welcome to add more info or correct me! Oh and someone seems to have done some soldering on my main board and that connector is missing! if anyone knows what that part is, or how I can fix without one...