If the field "phone" doesn't have hyphens in it as commented by Frank in another answer, you can always strip by using LEFT( x, at()).. such as
replace Phone with left( phone, at( ".", phone ) -1 );
for at( ".", phone ) > 0
If you have a format with decimals as place-holders for the phone, such as
1.800.TRY.MORE.
You might have to use the optional 3rd parameter of "AT()" function which indicates which "." instance you are interested in. In the example of 1.800... you could try
replace Phone with left( phone, at( ".", phone, 4) -1 );
for at( ".", phone, 4 ) > 0
AT() function is basically
Look for "X" found in string "Y" and optionally, look for the "n" instance such as
AT( X, Y, n )
Hope this helps.