No idea what that is. Don’t think Samsung or T-Mobile would put something on your phone that would do that. That would definitely concern me though. I wonder if something malicious got installed. I’d probably do a factory reset and start over.
Yeah, this is common for an infected device. The malware authors want ad bucks from sending your phone to sites. Phone needs a data wipe, unfortunately. Make sure not to blindly restore all currently installed apps too.