What are the requirements? TEL3 Support Team Updated November 15, 2016 23:14 Follow Compatible with iOS 3.2 and higher An active account Your iPhone number registered as an Instant Access Number Related articles Why do I get an invalid number message when I try to place a call? How do you know if the call goes through with your service? What if I place a regular domestic call with the TEL3Dialer app, will I be charged by TEL3? Can I make calls from any phone with my TEL3 account? Comments 0 comments Article is closed for comments.