Frustrated and fed up with waiting for Verizon to finally fully support an operating system that is almost two and a half years old now, I decided to experiment and play around with things myself. Here is what I learned:
For some reason, the "dial your number" network hack that people got working didn't work for me. I set up everything as the tutorials all said (GRPS (GSM/2G), APN to "vzwinternet", dial your phone number, user name is phoneNumber@vzw4g.com, password is vzw, CID 3, etc). It just would not work for me. Maybe it's becasue I had my UML290 hooked up to a Windows 7 box that updated the firmware, which may have rendered this 'hack' inept. I don't know; all I know as that, despite trying to get this method to work for several days, I was never able to get it to work.
There was no way, as far as I could see, to force the Verizon Access Manager (VZAM) software to run in 32bit mode as you can with most other programs. Typically, you can hilight a program, press CMD+I and select a checkbox to run an app in 32bit mode, but no such option existed for VZAM (for whatever reason).
Finally, I found a workaround to get the modem working until Verizon gets their act together and makes VZAM work with 64bit OS X. Here's how:
You should have put "64-bit" in your title. That hackery is YOUR OWN COMPUTER and nothing to do with VZW. Yeah of course putting your computer into 32-bit mode it works with the 32-bit mode app.
Hey, it's a simple fix that should give most people what they want until there is full VZW support: the ability to use their card with the VZAM software. I didn't see anyone else offering that suggestion... If you don't want to use it, you don't have to.
At the very least, this does seem to prove the theory that this is an issue with the 32/64bit compatability that some have refuted.