ZeroZero is like no other mobile product on the market today.
ZeroZero fits between your network SIM card and your mobile´s
SIM reader.
Most of the time ZeroZero will just sit there minding its own business,
but when you dial an international access code, ZeroZero will come to
life and start saving you money.
Instead of letting your regular SIM direct your international call directly
through your network at a sky high rate, your ZeroZero SIM will
direct your international call through a local network number, so your call
is charged at a local rate. Your only extra cost (over your normal local call rate)
will be the small charge made by ZeroZero directly from the credit amount you
already charged to your account when you bought your ZeroZero.
India 1p Poland 1p
Australia 1p Pakistan 5p
USA 1p South Africa 3p
Source :
http://www.zerozerosim.com/