I've had a similiar problem since my wife changed her phone.
Car 04 325 cI C with ULF. Phone is a Verizon Env3. Prior phone was a RAZR V3.
Even had my dealer try to pair it with the Verizon Env3 .. no luck..
It WILL pair with my son's BT ear piece, and I have not tried it with my 06 X5, which pairs fine with my LG 8300.
I don't know how to tell which ULF or TCU ( I do have Voice Reco in my X5), I have, but if I am able to successfully pair her phone to my X, can I assume that upon discovering what type of device is in the X and version ie, TCU vs ULF and Gen #, if I replicate it in an E46 will her phone work?

Thank you
ED