That's not an issue for Sky Glass, but if you have Sky Broadband then the bundled Sky Talk Internet Calls has an unpleasantly high cost per minute for outbound calls if you didn't opt to add an inclusive bundle (Evenings and Weekends Extra, Anytime Extra or International Extra)
* * * * * * *
Sky Glass 55" (on ethernet) & two Stream Pucks (one ethernet / one WiFi)
BT Halo 3+ Ultrafast FTTP (500Mbs), BT Smart Hub 2
