07755 numbers was run by a telecom company to assit people making cheap international calls. 07755 numbers were banned from network minutes on pay monthly contracts.
Do you want an access number?
If you do read free calls to india
About 1 year ago there used to be access numbers on 0870 T Mobile that allowed the user to make free international calls. Once again the large telecom companies wanted you the customer to pay so those number were stopped
Then o2 started their o2 international friends and family deal which was pretty good for a while