What do the messages mean when they offer me to switch to premium service?

David S. McCahanDavid S. McCahan Posts: 2FreedomPop Newbie
My plan calls for unlimited voice. I have recently been in places where I tried to make a call and I got a message on the screen saying that the reception may not be good, would I like to switch to a different plan. Sorry, but I can't recreate the screen here but that is the gist of it. With that limited information can someone please tell me what is going on?
Thanks for your help.
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