Phone Number Brackets

Try this. Assumes a North American starting format. 

var text Tel = ToText([My Phone# field]);

var text RemoveBracketOne = SearchAndReplace($Tel,"(","");
var text RemoveBracketTwo = SearchAndReplace($RemoveBracketOne,")","");
var text RemoveHyphen = SearchAndReplace($RemoveBracketTwo,"-","");


$RemoveHyphen

phone# to 10 digits prefixed with +1

var text Tel = ToText([Mobile for Drug test Notifications]);

var text RemoveBracketOne = SearchAndReplace($Tel,"(","");
var text RemoveBracketTwo = SearchAndReplace($RemoveBracketOne,")","");
var text RemoveHyphen = SearchAndReplace($RemoveBracketTwo,"-","");


SearchAndReplace($RemoveHyphen," ","")