given a phone number, what are all the methods to contact owner of phone number

two is call the number

Three is have someone else call.

I was very tempted to just reply "WUPHF.com!' :)

What is your objective in finding out all possible ways to contact the owner of the phone number?

As such Verizon is xxxxxxxxxx@verizon.com.

Leading to the correct answer but I do not know an algorithm to find provider for every phone number

My problem is I am in contact with many foreign people who visit united states and their phone number does not work. So they sometimes use whatsapp given an internet connection

Here is a list that will help you hopefully.

http://www.emailtextmessages.com

http://www.emailtextmessages.com/

is searching for cell phone provider to send an email

okay email is one method to contact owner of phone number
another is
whatsapp
another is sending sms

so that is 3 total.

what are other ways to contact.
especially because owner of phone number may have phone turned off or disconnected or bill not paid

If a phone is off or the bill isn't paid then sending a message to the phone won't work.  What are you trying to accomplish?

contacting people who are visiting united states without access to cell signal.
So they use wifi

I am contacting people who are visiting united states without access to cell signal.
So they use wifi


What are different methods to contact
sms, email to sms, whatsapp, call

Are there any other methods of contact?

I like the explanation of how to cold call a list of phone numbers without making a phone call
but best answer was email of phone number

thanks