Rs. 47 one month GPRS 1 GB pack from Docomo

Hi,

I have tata docomo mobile connection and I just saw that it is flashing ( the auto services messages) showing that we can get 1GB data for one month for Rs. 47 only but when I checked their plans online then there is no Rs. 47 pack but there is RS. 48 pack but it is not for full month , it is for 21 days only .

I hardly use 200-500 mb data whole month on my mobile and still I pay for 2.5 GB every month so I think if 47 pack is true then it will be again saving .

Anyone using TATA DOCOMO knows anything about it then please let me know.