Mobile Number Transportability And Roaming In India

I have any interesting link for you : http://www.dot.gov.in/as/MNP/MNPindex.htm

The link to the pdf published by DoT about the dates of number tranportability in India : http://www.dot.gov.in/as/MNP/press%20release%20for%20MNP.pdf

Make a note of the dates specified by the DoT and see today's date on your calender. :) .

A lot of people like to change there Mobile Network provider. I have another good link to show you guys the statistics : http://www.pluggd.in/mobile-number-portability-in-india-operator-switch-survey-297/

Many of Indian like to get this feature including me. For me the aim is to get lower standard call rate. That means reasonable call rates at no new recharges for tariff reduction. There are a lot of recharge vouchers available for just the tariff reduction so it isn't easy to keep track of it so that I get the best tariff. That is why I like to have a standard call rate.

Another feature that I really like to have is 'No roaming rates across India'. Or 'no roaming rates across south India' - for south Indian customers and 'no roaming rates in north India' - for north Indian customers. The roaming rates have been dropped sufficiently but, no roaming rates for incoming call is a very good feature for common man like me. If incoming call rate in roaming can never be erased, say a recharge voucher for Rs:100/- and no roaming rates for one year is also an affordable and convenient way.

I got these details from Wikipedia , the processes taking place when a cell phone is in roaming :

The details of the roaming process differ among types of cellular networks, but in general, the process resembles the following:

1. When the mobile device is turned on or is transferred via a handover to the network, this new "visited" network sees the device, notices that it is not registered with its own system, and attempts to identify its home network. If there is no roaming agreement between the two networks, maintenance of service is impossible, and service is denied by the visited network.
2. The visited network contacts the home network and requests service information (including whether or not the mobile should be allowed to roam) about the roaming device using theIMSI number.
3. If successful, the visited network begins to maintain a temporary subscriber record for the device. Likewise, the home network updates its information to indicate that the mobile is on the host network so that any information sent to that device can be correctly routed.

I wonder 'why do we have a home network and temporary subscriber record?'

A company like BSNL is having its own network across India. Why are they using a temporary record for the device in roaming when they can use the device's home network record.