Two-way pagers are like pagers on steroids, bulked up and powerful compared to regular pagers.
Most versions can do e-mail, access some web content, and even do instant messaging.
They use nationwide two-way paging networks to send small snippets of info. These devices, especially RIM s Blackberry, have become extremely popular due to their small size and small keyboard. Two-way pager are best for users who require some sort of efficient mobile email solution. But there are some rough edges. For example, unlike PDAs, these pagers are not designed to add your own applications.