Is there a cheaper alternative to TouchScreenTune, $5 for the app is quite steep!
Try SGS Touchscreen booster
it's Free and good but not as great as TouchScreenTune.
I've just got one ( using speedtouch 585 )
what I did is:
1. connect to network, then go to the network sittings and use Fixed IP for the device u want
2. on the phone go to: sittings > wireless & N... > Wi-Fi settings ...