Watsab is preparing to abandon some older devices from here until 2019

Washington– Watasab should abandon some of the oldest devices by 2019 as part of projects to develop its systems adapted to technological developments around the world.
Wesab will stop working on iOS 7 and earlier, as well as on Android 2.3.7 Gingerbread and Nokia Series 40.
This means that users of the "Nokia Series 40" will not be able to create new accounts on Wattab and that some features of the application may no longer work at any time, according to Dignited.
On December 31, support for Nokia S40 will cease and, as of February 1, 2020, versions "Android 2.3.7" or earlier, as well as "iOS 7". Or older copies. – (Petra)