APRS is a fun way to transmit signals over long distance. It is not just for vehicle tracking and weather, although a lot of people use it for that. With the help of iGates or Digipeaters a simplex packet can go a long way.
You can send messages from your Radio to any cell phone, if you know the phone number that is. To do so simply follow the example in the photo.
Type in SMSGTE in the to: field at the top.
In the message field type in @cell # and then a message. Press MSG TX in this case and check the phone.