First, just switched over from Comcast to Centurylink. I discovered some time ago while on Comcast that if you create a FB account using an IP that's already logged into (at some time) a different account under the same IP, you get the darn "Mobile Phone Verification" message. Solution was simple enough, just change the MAC of your router to get a new IP through Comcast and your good to go and off making another FB account. It took me a while to figure out how to change my IP with Centurylink DSL, but finally did it. Went to create a FB account with an IP I had never signed in with before, and bam, got that #!%$!! mobile verification message. Far as I can tell there's no way around it, and I don't plan on buying a bunch of prepaid cell phones. So the question is, what triggers this cell verification "concern?" Is it because Centurylink is a dynamic IP pool service, possibly? It's the only reason I could see why this happened with Centurylink on the first IP change, but never happened with Comcast.