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GauriiGaurii 

Can any one suggest how can we have validation rules on phone number field validating formats for different countries across Europe ?or any?

Can any one suggest how can we have validation rules on phone number field validating formats for different countries across Europe ?or any?
Subramani_SFDCSubramani_SFDC
If you are only going to verify US, you can use this:

AND(OR(BillingCountry = "USA", BillingCountry = "US"),
NOT(REGEX(Phone, "\\D*?(\\d\\D*?){10}"))
)

Adjust USA and US to match how USA is entered in your org.

https://success.salesforce.com/answers?id=90630000000gqNkAAI