1. Visit Nexus123, fill your details. You need to enter your correct phone number, email address. I am not sure if it is only available to people living in USA and Canada. However, calls can be made to any part of world.
2. Check your email and click the confirmation link (sent by Nexus123) in order to verify your email.
Your free account by Nexus123 is active now. To make free calls you need to dial the access number. A list of access numbers can be found on Nexus123 website.
No need to pay anything in order to get free minutes.
No credit card required to register for free account.
No maintenance fees or hidden charges of any kind.
Call rates of Nexus123 are comparable with other calling cards and voip providers, calls to India from USA are charged at 5.6cents/min.
To make the Nexus123 service a unlimited calling plan one, following things can be tried.
Register with another phone number and email address. ( you will get additional 10 free minutes).
Append a digit to your original phone number,(ex. if your phone number is 5126985, try registering with 51269850, 5126985(1-9). This way you can register with same phone but you will get more free calling minutes.