Thanks everyone for the clarification. I didn't realize there were so many of the Calypso phones still available *new*. I was only aware of eBay and some obscure Polish auction site. Now that I know they are available in single quantities from AliExpress, that's a whole different scenario.

With those kinds of quantities, you are all correct that there is no need to even think about a hardware design.

Thanks for all the feedback and keep up the great work!

Scott