Question: how to make ringtone longer on iphone xr?
Answer: Open the phone app and dial *#61# on the Keypad. ... 
Locate this text on the screen: "Setting Interrogation Succeeded, Voice Call Forwarding, When Unanswered, Forwards to +" and record the 11-digit number after the + symbol.
Touch the Dismiss button. ... 
You should receive the message: Setting Activation Succeeded.