Can’t have multiple calls open – Touch Fin RPN Review

I had the 11, 15 and 16. Opened one today and was told it was being “sunset” and I should get this one instead. Once I opened my old ones, the new app worked fine with no ads. It it has one huge disadvantage. I use to keep the 16 and the 11 open at the same time. Now I have to switch modes. That is NOT an improvement.
Review by Dhjdhj on Touch Fin RPN.