Today my PC5750 is unable to connect using Global Access (EVDO). Everytime i tried to start connection it keeps changing from EVDO to National Access.
After searching the web, finally i able to force it to use EVDO. this is the way how to do that:
1. Open your VZAccess Manager
2. Press Ctrl+D. You'll be prompted to input a password. the password is diagvzw
3. The Support window will be shown to you
5. Choose Mobile IP Preferred and HDR Only and then click OK
6. Close the Support window
That's all, i hope it'll be useful for you :)