在ASP.NET MVC中，可以使用RegularExpression特性来验证手机号码。

public class Customer
{
[Required(ErrorMessage = "必填")]
[Display(Name = "手机号")]
[RegularExpression(@"^1[3458][0-9]{9}$", ErrorMessage = "手机号格式不正确")]
public string PhoneNumber { get; set; }
}

在HomeController中：

public class HomeController : Controller
{
public ActionResult Index()
{
return View(new Customer());
}
[HttpPost]
public ActionResult Index(Customer customer)
{
if (ModelState.IsValid)
{
return Content("ok");
}
else
{
return View(customer);
}
}
}

在Views/Shared/_Layout.cshtml中，必须引用异步验证的相关js。

@Scripts.Render("~/bundles/jquery")
@Scripts.Render("~/bundles/jqueryval")

在Home/Index.cshtml中：

@model MvcApplication1.Models.Customer
@{
ViewBag.Title = "Index";
Layout = "~/Views/Shared/_Layout.cshtml";
}
<h2>Index</h2>
@using (Html.BeginForm("Index", "Home", FormMethod.Post))
{
@Html.LabelFor(m => m.PhoneNumber)
@Html.TextBoxFor(m => m.PhoneNumber)
@Html.ValidationMessageFor(m => m.PhoneNumber)
<br/>
<input type="submit" value="提交"/>
}