I believe it's both send and receive as far as texts go. You're being charged for airtime, not for whether you're the one sending or receiving. Of course, if you have an Everything Text or Everything Data plan, this isn't an issue, since it's unlimited as part of your monthly plan.
As far as the charger goes, is the sound coming from the charger or the phone itself? And have you tried charging the phone from your computer, or just from the travel charger? I'm not hearing that sound, but then I've only used the USB connection, and not the travel charger.
If it's from the phone itself, I would take it to your nearest Sprint Store for service or replacement, assuming it's still under warranty.
Message was edited by: AdmiralSirJohn
