Jumblo is new VOIP Service from Dellmont Sarl, with Betamax back bone. Jumblo is offering free international calls to over 80 destinations and very cheap international calls to other destinations. Unlike other VoIP providers, calls to India Mobile are actually cheaper than calls to Landline. Jumblo provides the cheapest rate for India Mobile number. They accept payments via debit/credit cards.
Below are the rates for India Mobile at 0.011 cents / min and Landline 0.015. Check the rates for all other countries here. 
Jumblo Superdeals provides you free calling to over 80 destinations for 90 days with purchase of small credit. After 90 days are over, you can use your credit for calling destinations with normal charges. Jumblo also provides free trial calling from it’s website to international destinations only. Jumblo, in addition to providing normal SIP service features also offers below additional features
- Phone-to-Phone – Login to your online account and enter yours and destination mobile or landline number and Jumblo connects both the calls.
PC-to-Phone - Download the Jumblo Client and calls any landline or mobile from the convenience of a PC. - PC-to-PC – After installing Jumblo client, you can talk to your friends for free anywhere in the world.
- Local-Access-Numbers: Make good use of your freedays and credits and make cheap regular and mobile phone calls via our access number.
- Nokia Phone LowCaller – LowCaller will keep you connected on the go. Download and install the LowCaller application on your Nokia (and most other Symbian devices) and start saving on your call charges.
- SMS – send very cheap SMS across the world to anyone
Download to PC : Go to http://jumblo.com/en/download.html and Click ‘Download For Free’ to get the installer for PC running Windows Vista, XP, 2000. They don’t have dialer for UNIX, MAC and can use the web interface.
Jumblo SIP Settings for Nokia Phones or SIP Adaptors
SIP port : 5060
Registrar : sip.jumblo.com
Proxy server : sip.jumblo.com
Outbound proxy server : leave empty
Account name : your Jumblo username
Password : your Jumblo password
Display name/number : your Jumblo username or voipnumber
Stunserver (option) : stun.jumblo.com
For Jumblo Customer Service, login to site and go here.
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and free calls to many International locations. Checkout the 
50 countries around the world. iDPhoneCard is giving away 33 free talk time minutes to India as a free trial, No Credit Card or coupon code is required. After this trial period, you can use this service at 6 cents / min. Some feature – One minute rounding, No maintenance charges, No connection fees, No expiry date.
Reliablecom is another cheap VoIP provider which offers calling at 1.9 cents / min to India on every Monday and Thursday. Rest of the days, there calling rate is 2.9 cents/ min to India, 5.9 cents to Pakistan, 7.9cents to Middle East and cheap rates to Sri Lanka, Jamaica, Nepal, Philippines, etc. 
call rates to India is at 3.3 cents / min and the voice quality is very good compared with the cheap 1.9 cents promotion offer. They have 3-4 minutes call rounding which means if you talk for only one minute then you will pay for three minutes and have to pay 20% service fee per call. 1.9 cents and 3.3 cents products are only recommended if you compromise for call quality.