What is the best action to take when the inbuilt battery smart phone hangs?

[Stardom22]

ln the other day l saw a friend's smartphone that hanged so abruptly. The owner couldn't do anything to help the situation. She tried to take out the sim tray but that couldn't help out.
So what is the best action for one to do for that case?

 

[magnus2022]

The best action is to allow the battery to drain and off itself. Then you charge the phone and start using your phone. There is no need to remove the battery or sim.

 

[freelancermaria]

It is best to let your battery drain naturally. Give it some time, and it will eventually run out. However, if it does not, have a trusted technician take a look at it.