Verizon 8830 with United-Mobile SIM: incoming calls OK, no outgoing calls

Question

I have a United-Mobile SIM card which I've used successfully in a number of countries in an unlocked GSM phone.  I unlocked my 8830 a month ago before traveling to Israel.  Before leaving, I had the phone activated for global service so I could use the browser and send/receive email.  What I learned upon arrival was that those functions in Israel are provided by a CDMA network, which meant that I had to have the Mobile Network setting at either 1XEV or Global.  When set to 1XEV, the network is totally CDMA, which shuts off the GSM capabilities.  When set to Global, both 1XEV and GSM are theoretically possible, but when attempting to make outgoing calls the phone defaults to the CDMA network, which means that outgoing calls will go at Verizon's per-miniute rates.  To get around that, I swtiched to GSM, which terminates that CDMA functions.  Using the GSM network, however, calls do come in when placed to the SIM card's number, but no calls go out.
I checked with United Mobile about this for a possible solution.  They indicated that when using their SIM card there would be a United Mobile folder somewhere in the BB, but I was not able to find one.  Also, I pulled the UM card and substituted a local SIM card.  That worked perfectly, both incoming and outgoing.
So I'm wondering if the problem has to do with the fact that Israel uses a CDMA network for Verizon, whether there's some configuration I have to change on the BB or whether the UM SIM is in some way incompatible with the BB.  In that case, I need to find out whether the solution is to use local SIM cards or whether there's a "global" SIM card available with reasonable outgoing rates, free incoming calls, and no connection charge.  The UM SIM card is 29 cents a minute outgoing, free incoming, and no connection charge, but at the moment it doesn't seem to work properly in the BB.
I am hoping that the proper setting would be Global, allowing me to browse, get email, use BBM, and make calls as needed.  So far, I can't do that.
Suggestions greatly appreciated.

Answer 1

Judging by the lack of responses, it appears that no one has any suggestions.  I guess I'm stuck with using the BB for browsing, email, and BBM only while in Israel and using a separate GSM phone with the United Mobile card.  In the alternative, I suppose I could try a local SIM card in the BB.  Not a big deal, though I would prefer not to carry the BB and a separate phone when only one should be needed to do the job.