If you have an MTX any slot will work
If you have an LTX then tou cannot use the last 3 slots thes slots are not dual density...
Procom dos or procom plus will work... I also believe you can use MS hyper terminal. The verison of procom that sprint sold was just a waterd down version of procom

Also you can not use a ddei card in the last 3 slots...

Walter