A new set of VoIP telephony callback services is emerging. Two examples:
Jajah - http://www.jajah.com/
Estara - http://www.estara.com/
They are very simple to use, especially jajah which seems to be geared at quick consumer adoption whereas estara is geared more towards enterprises, invites you to try their service. Simply type your telephone number into one field, type the person’s number you are trying to call into the other, click call, and jajah will do the rest. Your phone rings, their phone rings and voilá, you are enjoying
reduced calling rates (around 0,02c/minute for international landline calls).
Many similar services will be emerging over the next months, with additional features which allow you access VoIP networks such as jajah and estara’s push-to-talk without even needing to access your PC or the Internet.