How could they not have any way to contact their customers?  You need to provide contact information when you sign up for a data plan, don&#x27;t you?<p>Even if you accept that the only way for them to contact their users is via their data connection (which, again, doesn&#x27;t make sense,) there are far less intrusive methods than injecting content into existing pages.  For instance, they could send the user to a separate notification page, perhaps with a helpful link to the resource that the user was intending to browse to.  No need to mess with (or see) the contents of any pages.