To make a call to a landline in India, dial 0844 720 2104 followed by the full international number in India, and you're connected! Calls to this number are 1p per minute.

http://www.webstertelecom.com/country/India.html

Here are the main advantages:

No account to open
Available 24/7
No hidden charges
Excellent line quality

Hundreds more destinations available, see http://www.webstertelecom.com/destinations for details.

Note:
You must have the bill payer's permission before calling
You will be charged from the time of connection to our service
Please hang up after a short time if your call is engaged or unanswered
BT apply a 12.5 pence Call Set Up Fee to each call
For customer services please call 0844 552 8575

You can also call India from your MOBILE phone for just 1p/min. A huge discount over
the prices that your network charges for these calls.

To buy a £5 calling card, text WEBSTER to 80550. You can then access the calling service from your mobile using the landline number 0207 124 6666.

Step 1: Text WEBSTER to 80550 and get £5 call credit or text WEBSTER to 80041 to get £3 credit sent to your mobile.

Step 2: Once you receive your confirmation text dial the following access number 0207 124 6666. You can use the credit directly from the mobile you text us from; or from other phones using a PIN number.

Step 3: At the prompt enter your destination number including the international code. Don't press send again. You can even use your credit from another mobile or landline, simply by keying in your PIN. For example if you're calling a Barbudian Landline:
Dial Access Number 00 91 [your international number]

00 91 is the international direct dialing code for India.

Enjoy cheap international calls from your mobile!

Note:
Each call is charged per minute rate for the relevant country. A connection charge equal to twice the pence per minute rate (up to a maximum of 30 pence) for the relevant country is also charged per call.
Higher rates generally apply when calling international mobiles and premium rate numbers. Call charges include VAT and are charged per minute, rounded to the nearest penny.
An access charge is also charged for the call to our 0207 number. At your service provider's standard rate or included in your call package.
You must purchase the card through an active UK mobile. Maximum purchase of £30 per day per SIM card.
The Services are provided by New Call Telecom Limited, a company registered in England and Wales under the number 7298834 with registered office located at c/o Collards, 2 High Street, Kingston upon Thames, Surrey, KT1 1EY.