Yes, you can port an existing US phone number to Ring4. (US only - Porting is not supported at the time in other countries)
To submit a porting request, go to the Ring4 website -> www.ring4.com and find the porting request section.
Once a porting request is submitted, it takes up to 48 hours until we can validate the number portability. When confirmed, Ring4 will ask for a proof of ownership of the number.
-Please note that Ring4 cannot reverse the porting once completed.
-MMS are not supported at this time.
-International SMS are not supported at this time.
-It has also been reported that some US short codes don't deliver SMS on Ring4. We are currently working on resolving the issue.