Bug 1007588 -[Cost Control] Implement an IAC mechanism to warn other app...

...lications about sending a SMS for requiring balance or making a SMS top-up
Do not add this `then()` call. Calls to `.then()` makes sense when the operation is async or the former handler return a _thenable_ object. Else, it is useless.  This then will be always resolved as the former one returns nothing. So the former promise will be resolved to `undefined` and the `onreject` callback will be never executed.