Phones aren't really toys anymore. It's pretty hard to function in society without either a phone these days. For example, you may find yourself cut off from banking, government services, unable to order at restaurants, etc. There are usually work arounds, but not always.

People will justify anything if it's beneficial to them personally. Wait until you hear about slave labor

Phones are not really energy-intensive. They produce negligible amount of energy compared to house appliances.

A fridge produces about 100 times more energy than a phone.