Question about iPhone applications and battery usage

[Bowlerguy10]

This is something I have always wondered about native and even 3rd party apps. Say I'm having an SMS conversation and I sent a text and then lock my screen with the SMS application still up and running, does this use battery life? What about other applications? I have always been in the habit of hitting the home button and making sure the application closes and then locking the screen and then just unlocking and going to application whenever a message comes in or whatever it may be.

 

[Maclver]

This is something I have always wondered about native and even 3rd party apps. Say I'm having an SMS conversation and I sent a text and then lock my screen with the SMS application still up and running, does this use battery life? What about other applications? I have always been in the habit of hitting the home button and making sure the application closes and then locking the screen and then just unlocking and going to application whenever a message comes in or whatever it may be.

I believe once you lock your iphone your application is stopped and when you unlock it, its brought back to its previous state that you left it in

 

[shollingsw3]

I wouldn't think the SMS application would use any extra battery life running like that. However, if it is an application like AIM or anything that uses the Internet connection constantly, it would definitely drain the battery much faster.

 

[shollingsw3]

I believe once you lock your iphone your application is stopped and when you unlock it, its brought back to its previous state that you left it in

Depends on the app. For example, AIM still receives messages when the phone is asleep/locked.