Tokiva Mobile is a powerful J2ME application that you install on your
phone that simplifies making long distance calls. It allows you to keep
an address book, call history, and purchase additional credits directly
through your phone without using expensive data or have to wait for
pages to reload.Once you register with them you will receive free
50 Tokiva credits, which typically covers 15 minutes calling time. If
you want more talk time just invite more friends to join. For each
people signup under your name you will get 15 free Tokiva credits.