Yesterday, this notification appeared on my phone: "Ready to activate? Call (877) 807-4646 from another phone..." I've had my Samsung Galaxy S5 for over a year. I've made no new changes to the phone or the account. Why did I get this notice and how do I get rid of it? Is this a known Verizon Wireless number? With all the scams out there, I'm a little afraid to just call it...