Problem

A user can change the text size of an article by pressing numeric keys on the keypad on a KaiOS phone. At present, we have assigned numeric keys 4 & 6 to decrease & increase the text size respectively, and 5 to set it to default. This seems to be working fine on the Jio one device, however, numeric keys are not responding on Jio 2 device.

One of the differences between these two devices is that Jio 2 devices use the QWERTY keyboard whereas Jio one devices come with a simple keypad.

Solution

Map the actions for decrease text size to the S key; default text size to the D key, and increase text size to letter F respectively.
The messaging within the setting on text size should not change, let it read "Press 4 to decrease size..." in the way it is supported on candy bar devices today