[zaq123]

I have just done multiple testings with the dialer and s2u2 is definitely the culprit.
It is it's CAller ID function and the screen with the green and red button is part of s2u2 's caller id. disabling s2us without first disabling the caller id won't remove your phone from using s2u2 caller id function.
Disable the caller id
the phone will say it needs to be reset.
The dialer should now be working
(to disable the slide2answer -s2a- the caller id function has to be enabled)