Hi, The mask comes from Configuration → Company screen → Company details tab, bottom-right. Remove here:

Phone Masks are located on the Companies screen. 

Great, thanks a lot laura01! 

Thanks @laura01 

This is great, but wouldn’t you agree that this mask should be by Country?  For instance, If an entity’s country (customer, vendor, employee, contact etc.) is another country rather than the country of the company, then the phone number mask will be different than the one set at the company level (except for Canada and USA)

Hello @nperez94naw ,

The Original Poster asked how to remove a default mask from phone numbers in Acumatica and I answered that question.

It seems you have a new idea about improving/changing the way Acumatica handles default phone number masks/formatting.  Please go to the Ideas section of this Community and post your idea. Then we can vote for it.  Thank you!

You are right @laura01 

Thank you

I will post it as an idea. 

@laura01 

See it’s there already. 

@nperez94naw , I voted!