I belive the 5200 uses the standard service menu access
menu / 0 / 000000 / network select / 1xonly OR cdma only / OK / end
EDIT:
to dial your ISP you do NOT need to disable evdo, the disabling is only for using verizons ISP phone number which is #777
to dial your ISP phone number it is NOT necessary to turn off evdo, dialing your ISP will be treated like a regular phone call
just create a dialup connection and input all info they way they want it.
in fact all you need to do is open the connection mgr, nd copy/duplicate your people PC connection, then open the properties of the copy and change the modem to your lg vx5200 phone/ cdma modem, replacing the modem that s listed there. but it will be a very slow connection about 9-14k
it will NOT be using the verizon 1x backdoor and will not be at the same speed