For example: do you still read that magazine? Could you get away with less mobile data? Revisit your expenses annually (at minimum) plus anytime your needs or life situation changes.
Every year or so, shop around and get two to three new quotes on your recurring expenses. Switching to a competitor or taking advantage of promotions could save you hundreds.
Maximize your spending by paying with a rewards credit card. Even better—use a card that offers higher-earning categories. (For example, groceries, gas, restaurants.)