A nasty side effect of debt is the interest rate. However, it is a necessary evil for borrowing money but failing to pay it off quickly enough, and this is as good of a reason as any to make sure you pay your debt quickly.
By freeing yourself of debt, you can put the money you used to pay towards debt into your savings account. To make this easier, you can consider money making opportunities that will add a little extra to your monthly earnings and direct this towards paying off debt.
Those who use credit cards regularly and pay them off on time will have better credit scores than those who still need to make payments, which means they will struggle to get a new phone plan, car, or even a house as their credit score is not sufficient.