Tata Docomo 48 rs plan 150 kbps speed downloading

i m getting 150 kbps on recharge of Rs.48 without any trick.
i got a message from company 
''hi! You will now enjoy 3G speed on the balance of your existing GPRS pack. After pack expiry, you'll becharged 10p/10kb. To enjoy 3G speed, restart your phone'

Posted in: Tata docomo, tata docomo 3g