AT&T has updated its Unity calling plans to include a new international calling plan. AT&T's Unity Worldwide Calling allows users with both wireline and wireless voice subscriptions to call more than 220 countries for an additional $4.99-a-month. This is not the first time AT&T updated its Unity calling plans, which launched earlier this year. Unity subscribers can make unlimited calls to any mobile or landline user within AT&T's network.

The most recent Unity update added Rollover minutes, a staple offering from the former Cingular Wireless, and dropped the requirement that Unity subscribers must have a long distance calling plan.

For more on the new international calling plan:
- read this press release