Brian,
Glad you got everything ironed out. I'm leaving for Jamaica Apr-19 and would like to be able to access my BB emails via a tmo roam. Any advice for attempting this without an ATT sim card?

As you first land you probably shouldn't have a problem. From experience it only happening after a few weeks down here and then it has a problem. It happened again to me and i had to do the same procedure again with another sim card. If it happens to you and you don't have another sim, go into your options and select Host Routing Table, scroll down till you find carrier (33818030), click your scroll wheel and do a register now and see if that works.