Validations the textbox have to accept only numbers

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MVC5

When iam clicking on my textbox it accepting charaters and displaying enter the 10 character when i enter 10 characters it showing enter 10 digits number for phone Number

What I have tried:

My .cs Code
[Required(ErrorMessage ="enter 6 Digits Number")]
[Range(0, int.MaxValue, ErrorMessage = "Please enter valid integer Number")]
public string Pincode { get; set; }

[Required(ErrorMessage = "Phone Required")]
[Range(0, int.MaxValue, ErrorMessage = "Please enter valid integer Number")]
public string Phone { get; set;

.cshtml

@Html.ValidationMessageFor(model => model.Pincode)
@Html.ValidationMessageFor(model => model.Phone)