checking your balance.. is that an online connection to see that?
100 pesos.. what is that worth?
how much does data cost you?
the android phones also use data to update a lot of things in the background.. weather, facebook, maps, etc...
you can turn off all carrier network data... only turn on when you really need it.
DropBox: register for free space (we both get 500MB extra space): http://db.tt/sWYVl3j6