We always turn the router and house phone off if we are away for more than 24 hours. The risk of fire from the chargers is minimal, but why take any risk at all if you don't need to? The router starts up quite quickly when we turn it back on. It's quite possible that the phone loses it's stored numbers, I've never looked - we don't use our house phone much anyway so that isn't a problem.
And I ALWAYS turn the TV off when it's not in use. Flatscreens left on standby are a statistically significant cause of house fires as well as a waste of electricity.