Do I have to "Enable voice roaming"?

[jeffandpamsmith]

I have Solavei and dont seem to roam on ATT even in the hospital I work in where an ATT tower is on the roof and ATT phones get 4 bars. I get none.

I see where I can enable digital roaming, but not voice. Sprint/HTC Evo had "eneble voice roam". Solavei says I have it and it is activated, but do I neeed to do something to the N4?

 

[Citizen Coyote]

Under Network operators, set it to "Automatically choose operator" (or something like that). Otherwise, I don't recall ever seeing a voice roaming option on the N4.