If you haven't already done this, it's way past time that you do. Very few people need a landline anymore now that communication is more mobile. In fact, communication is so immediate that even if you have a landline number, people will often forego that in favour of your cell number. Plus, it will save you money. The only risk is that it may be more difficult for emergency services to trace your location when you call from a cellphone, depending on where you live.

Approximate savings: $360 a year (at $30 per month)