look up the .pdf for verizon at this link
http://www.supplynetwireless.com/drivers.cfm
the .pdf shows how to set your phone and pda to work on both the express and standard network.
If you have a KWC 2135 phone it is Express Network Capable..
To access the 144k you must be in a express network area or it will fall back to 14k
hope it helps