What do we say in the invite? Not much!
Take a look at teenagers and what is becoming the normal way of staying in touch and arranging to meet up? SMS, FB, Viber, WhatsApp, etc. People are ignoring either conciously or unconciously a ringing phone. However, observe what happens when someone receives an incoming message alert! It's irresistable!
Click on the links for examples of Using the Phone or By Messaging
Arranging to meet family and close friends, you may prefer to do by phone and thats fine but do follow some of the guidelines or rules that make it go smoothly and rejection free.
Using messaging allows you to setup many more meetings in far less time, so it's great for an initial burst of getting touch when getting started.