MNP, or mobile number portability, allows cellular users to change their mobile service provider while keeping their original phone number. It involves a port out process to deactivate a subscriber from their existing provider and a port in process to activate them on the new recipient provider's network. The porting transaction is facilitated through a number portability clearing house and gateways to intercept and route calls to ported numbers on the new provider's network.

2. What is MNP ?
MNP – Mobile Number Portability is defined
as:
Ability of a cellular mobile service user to
change his/her subscription to another
cellular network operator while retaining
his/her original directory number (including
the Network Dialing Code/Operator prefix)

3. There are three number portability services
 Operator portability
 Location portability
 Service portability

4. It refers to the ability of an end user to
retain the same telephone number when
changing from one operator to another. It is
also referred to as ‘service provider number
portability.

5. Location ortability
It refers to the ability of an end user to retain
the same telephone number when
changing from one physical location to
another without necessarily changing their
operator.

6. It refers to the ability of an end user to
retain the same telephone number when
changing from one type of service to
another without necessarily changing their
operator.(e.g., from old telephone service
to ISDN)

7. Donor: Existing Service provider who is
providing service to the customer.
 Recipient: Service Provider where the
customer wants to move for services.
 Port In: Process of activating a
subscriber on the recipient’s network.
 Port Out: Process of deactivating a
subscriber from the donor's network .

8. Snapback: Process of returning a mobile
number to the original service provider
(owner network) after deactivation on
Recipient network.

9. NPG
MNP Database
NPG
NPG
NPG
NPC
NPG
NPC:
NPG
Number Portability
Clearing House
NPG:
Number Portability
Gateway

11. Two stages are involved :
1. Interception Stage.
It’s the recognition that the call is toward a ported number. It can
be performed at :
Donor switch (local exchange where the subscriber line was
initially attached before being ported),
Transit switch , originating switch (the switch from which the
calling party’s call originates).
2. Routeing Stage.
The call is re-routed from the intercepting switch to the new
terminating switch.

18. 
You can shift your old mobile service provider to new better
mobile service portability, keeping your mobile number
unchanged.

The porting transaction charge is very low, just Rs. 19. Thus it is
quite affordable.

The formalities involved in MNP are quite nominal. You have to
just send a SMS followed by the filling up of customer application
form for MNP.

The whole process of switching mobile operators will take of
maximum number of seven days only.

There are approximately 700 million mobile users countrywide
with about 10 operators in each circle. Thus MNP is going to
prove a great benefit to them.

19. 
To bring higher marketing expenses for
mobile operators followed by lower profits.

MNP could be a headache to police
department because the criminals can
misuse the portability duration of 90 days.

MNP is that you lose all your remaining
balance in your prepaid account on
porting to new number.