Not all devices are supported because some devices do not have a suitable measurement chip (or interface) and cannot be supported at all. Please read the list of unsupported phones at the end of the description, unfortunately some Samsung devices do not give correct (measured) values (eg: S5), just the maximum possible charging current with the actual configuration of the USB cable / charger. This is a firmware issue.
Supported Android
{4.0 and UP}
Supported Android Version:-
Jelly Bean(4.1–4.3.1)- KitKat (4.4–4.4.4)- Lollipop (5.0–5.0.2) – Marshmallow (6.0 – 6.0.1) – Nougat (7.0 – 7.1.1) – Oreo (8.0-8.1) – Pie (9.0)