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The best way is to replace the phone number field for a text box and then change "validation" for "numbers" option. If you wish to have specific amount of digits inserted you can also use "input mask" to define how many digits the user must insert:
If you have more questions please let us know.
perfect, thanks, I've changed, but allows me to put letters and numbers
Did you choose Numeric under "Validation"? Choosing that option will not permit any characters aside from numbers.
1. Click on Validation then choose Numeric.
2. An error will popup when you add text characters.
but it's great, I do not think I have problems as well