Android Question Dual sim phones - turn sim on/off

[Graeme Tacon]

Is there a way in B4A to turn the second sim card on/off in dual sim phones ?

In the link below, it shows that it can be done in Tasker (without rooted phone).

 

[Erel]

It looks like it sets an undocumented setting that works on some devices and fails on others (see the discussion).
Most of the dual sim features are not official and therefore don't work on all devices.
There are several threads about dual sims, which you should check: https://www.b4x.com/android/forum/pages/results/?query=dual+sim