We always try to recommend the best plan to our users, and we do take into account that your usage will change from month to month, but it’s not always clear how much room a plan gives you to make extra calls. Calling outside your allowance can end up very expensive, so we decided to mark out the safest plan.

We put the safest plan marker on whichever plan provides you with the most room in its allowances to make up for those extra calls that you can’t predict. It won’t always be the cheapest plan, but it might be the best choice.