Gravity Form validate phone number in specific section

1. The phone number field applied the rule of "Must be given value" with value [0-9] to limit phone number filed only accepts numbers.

2. The phone number field applied the rule of "Length must same as given number" to limit the phone number field length must be 11.

3. The phone number field applied the rule of "Must be numeric value and between given values" to limit the phone number must between 94588700000 and 94588709999

* The validation message can be customized.