Because it's not mobile service and you can't make calls if you don't have some kind of a data connection. I'm saying this as someone who's used a GV as my prim

Because it's not mobile service and you can't make calls if you don't have some kind of a data connection. I'm saying this as someone who's used a GV as my primary number to give out to people. Additionally a ton of things like banks don't like that it's a VOIP number and won't let you use various services tied to it. EDIT: In case you're not from US, US Cellular is a full regional cellular provider, they aren't asking how to get a US phone number.