Validating phone number in ruby

Question

What are the rules for validating a North American phone number? Also, is there a regex I can use? Is there a gem to do this?

Here are few rules I have

Answer 1

If you want something more advanced than a regex, Twilio has an API that can do this:

Twilio Lookup is a REST API that can:

Verify that a phone number exists

Format any international phone number into its local standard

Determine if a phone number is a cell phone, VOIP or landline

Discover information about a phone number’s carrier

I haven't used this yet! But it should work, though you do need a (free) Twilio account. (Also I'm not affiliated with Twilio, other than having a free account I'm playing with.)