The App won't work with IOS 12......so forget it on older iPhones anyway.
Shame as I would have liked to use it but I'm not buying a new phone just for that.
These are the devices that support IOS13...
Phone XS, XS Max, XR (2018)
iPhone X, 8 and 8 Plus (2017)
iPhone 7 and 7 Plus (2016)
iPhone 6S and 6S Plus (2015)
iPhone SE (2016)
iPod Touch, 7th generation (2019)
So the oldest compatible phone is the 6S from 2015. Clearly this app is aimed at the young who change every 24 months and those who don't keep their phones for longer than 4 or 5 years....
