How to press the + key

[greentea]

I have IDD call to press "+" in prefix, but the FN key is not work in calling mode, it will show up T only. Please advise how to fix.
thx

[Manolito]

Press and hold the 0 (zero) key for more than a half second!
Hope it helps! :)

[SecureGSM]

Just press and hold the "0" key for 2 sec.

[greentea]

thanks all!