First lets talk about Zadarma free trial credit plan. Zadarma is offering free 20 cents credit to make international calls. This free credit will last for about 10-12 minutes to call India. Actually Zadarma offers many plans, some are paid ones but these offer free calls to about 20 countries, the free trial plan is a standard one which does not even ask to buy any credit.
To get free trial credit with Zadarma :
1. Register with Zadarma. Please note that it only asks for valid email address for verification. Phone number or SMS verification not required. Effectively free 20 cents for one mail id account.
2. Verify your email account by clicking on confirmation link.
3. You will see 20 cents in your account. You can use this credit to make free international calls.
Now how can you use this free calling credit to call India :
1. You can make SIP Calls.
Server : sip.zadarma.com
Configure Fring in your Android or iPhone and make free calls. Configure X-lite/Nimbuzz to make Pc to Phone Calls.
2. You can also make PC to Phone Calls directly from your Zadarma account. Try Zadarma webphone. It works ok.
This way make get free trial credit with Zadarma and make free calls. If you are looking for longer duration cheap calls to India, try IndiaLD.