Need cheap Translation Equipment for church?

I learned a good trick from our son's church this week. You can use cell phones and a conference call instead of translation equipment. All you do is set up a conference call and have those wanting to hear translation dial that number with their cell phones. Of course some won't want to use their minutes for translation but others within your church will have unlimited weekends or Sundays and can loan their phones.
It's a great work-around for some situations.
Thanks Thad.