Ever heard of those Dual Sim based mobile phones which come with a feature of running 2 SIM cards in a single mobile phone handset. All the devices like HyperCard, HyperSim, China3GPP, StealthSim, MagicSIM etc come under this category where in the physical EEPROM device is actually installed over the normal SIM card on your SIM card slow in the mobile phone handset.
This device works for every SIM card issued aftr 1998 and its small enough to be installed over the SIM card since the size of 9mm by 9mm and works parallely with your current SIM card offering you the power of running multiple mobile phone numbers in the same handset. You dont have to buy those chinese handsets which are not banned, in order to run multiple SIM cards in any GSM mobile phone.
In case you own a Apple iPhone, you need to first Jailbreak it and make sure the handset is activated with AT&T Sim card after which you need to download the port of Bladox Utilities on your PC and extract it following which you need to download AppleSaft 0.92 from bladox and extra it again on your PC in order to get the .trb file. Turn your iPhone with Turbo SIM & AT&T Subscription. The detailed procedure is posted here
Its a excellent procedure because at the end you get access to full calling, SMS, and EDGE capabilities.

good post about unlocking an iphone
Excellent post,very useful infact!! Must thank you for posting!!
is turbo sim are avalible in India…….or we have to use any adapters?