It is unusual to use the slamr driver in linux - it is more common to use the smartlink-modem-daemon in connection with the alsa AC'97 codec module.
the slamr driver taints the kernel because it is proprietary. The "kernel tainted" message is a warning that if you have trouble with this, you cannot expect support.
I've seen this problem myself if I used the gui to activate the ppp0 connection. If it is active there, then anything else will see the modem as busy. The other times I've seen this is when the modem dosn't hang up properly on disconnect. Usually fixed by making sure that "atz" is first in the initialisation string in wvdial.conf
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