There is no direct way for specifying it in TDMobile as in TD.
The way FRBhote suggested is the right way.
You could also set a validation rule for the bind (IsLessThenOrEqualTo: number) but it will only display an error message you entered when the user is over the limit, and it will still allow more characters to be entered.
Not so elegant I know, but I am using it with some success.
However, as both Igor and FRBhote said, you can always have second level of validation in Service operation for security reason as Client coding can be hacked easily.
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