how to display apostrophe in string

[Pallavi26]

I am trying to display apostrophe in the below string, it is working fine on desktop but not on mobile app

gs.addInfoMessage("Thank you - we\'ll take a look and see what we can do to help");

Please help

[Pallavi26]

I am using mobile app on android device....

[scott barnard1]

Ok so what is generating the message and how does it fail?