My phone (iPhone 14 PM) has two lines as well—Primary and Personal—under the same number. In “Cellular Data,” Primary is greyed out, Personal is ticked. I think this might have to do with the second IMEI—IMEI2–I chose during activation. Correct me, if I’m wrong.
I'm totally confused with the primary line, conversation/ personal/ business line issue. I recently switched from Tmobile to Mint, Mint to Visible. I can't call out if I am on the primary line to my husband or to some of my favorites, the calla just drop, and texts fail. I still have Primary network= UNAVAILBALE, and the 2ns line is Visible. This is RIDICULOUS... HELP