When I connect my Iphone 5C to Blue tooth it gets connected but only I can hear incoming voice. The called party cannot hear my voice. may i have the solution please.

I have just bought this expensive phone. I tried connecting to Bluetooth car kit. It gets connected but only incoming voice can be heard. No voice goes out from Iphone.

I also tried connecting to Samsung Bluetooth but the problem is same. There is only in coming communication and no out going.. But both the Blue tooth devices works fine with my Samsung SII.

A working solution help will be very juch appreciated. Thanks in advance.