If you do a lot of international calling, you can use RocketVoIP for unlimited dialing to other RocketVoIP members for $19.95 per month (up from $10 per month not so long ago). This is the plan for heavy users, since the more calls you make, the cheaper they become per minute.

In addition, since it will usually be evening or the weekend on either the caller’s or the receiver’s continent (think U.S.-Asia, U.S.-Europe, Asia-Europe), wait until you’re on your mobile plan’s free night-and-weekend minutes, dial the RocketVoIP access number, dial the overseas number you want, and presto: free international calling from your cell with no charge against your mobile plan’s monthly total.