Only number is allow not other sign like +, %,- and etc

Hi Guy

I have a question here. Is it possible expression under the valid_if for key data ONLY NUMBER under the data type Phone ? Very there is user keep key in +15 or +23 and etc

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Please try in the valid_if setting of the phone column

SUBSTITUTE(NUMBER([_THIS]),",","")=[_THIS]

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Please try 

AND(SUBSTITUTE(NUMBER([_THIS]),",","")=[_THIS],
NUMBER(LEFT([_THIS],1))>=1
)

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