the 595U should work with the Wi-REACH.
It's a CDMA modem, so you need to make sure the Wi-REACH firmware
version is 8.08.q11 or higher.
The modem is 1.5" wide, so it may be a tight fit into the modem slot
on the Wi-REACH since it is also 1.5" wide - but it should fit. In
case there is a problem, there is also a right-angle USB adapter which
will allow you to connect the modem to the Wi-REACH.
If you decide to buy it, follow the instructions in the manual how to
configure a CDMA modem with your cellular provider info.