Originally Posted by
gfunkdave
Yes, that's what you do. You just turn off data roaming and then force it onto a network that doesn't have a roaming agreement with the carrier. Then it will use the other SIM's data connection like wifi calling. The top of the phone will say "Verizon via Cellular Data" or whatever.
Wait, does turning off "Data Roaming" also turn off voice and SMS roaming? Because this would do the trick! I assumed that it didn't include control over voice and SMS since they went out of the way to call it "Data," the the "Cellular Data" switch clearly leaves the phone connected for voice and SMS.