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May 18, 2020 · Xfinity Mobile is a mobile virtual network operator, or MVNO. As an MVNO, Xfinity Mobile doesn’t own its own wireless spectrum, it buys wholesale priced access from one of the 4 big wireless spectrum owners in the United States. Xfinity Mobile runs on Verizon’s Network. Making a call? You’re calling on Verizon’s network. Using mobile data?. As we'd alluded to above, sending form data is easy, but securing an application can be tricky. Just remember that a front-end developer is not the one who should define the security model of the data.It's possible to perform client-side form validation, but the server can't trust this validation because it has no way to truly know what has really happened on the client-side..