If you're dealing with phone numbers, always normalize to E.164. It doesn't solve every problem, but it does a pretty good job of consolidating phone number iss

If you're dealing with phone numbers, always normalize to E.164. It doesn't solve every problem, but it does a pretty good job of consolidating phone number issues to one place in your code (namely, the place where the E.164 normalization occurs). If you're dealing with short codes or other highly regional things... Good luck...