Colleagues -- I need ideas for a lessons on using pre-paid phone cards!

Our agency is having a bit of a problem with a few of our adult refugee clients running up HUGE phone bills.
When we have  their phones installed, we get "local access" only, but some have managed to get their service changed to include unlimited services (including international long-distance).  The agency pays the refugees phone & other utilities for 3 mos., but NOT $700 phone bills!  

Most of the refugees use international phone cards to "call home".  Now the agency bosses want me to cover the issue in our "Basics for the U. S." classes (money; drinking/driving laws; carseats; 9-1-1; job safety, etc.).  

I've never used phone cards, so I'll need to learn the basics myself, but I could use some suggestions for teaching.

Thanks!

Dottie Shattuck
ELT coordinator
Hebrew Immigrant Aid Society
Charlotte, NC
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