Just like Health Insurance portability , mobile numbers portability is there .. you can soon see savings account portability . Which means that you will be able to shift your bank account from one bank to another without loosing your account number . Right now , most of the people do not change their bank account number just because it means change in their account number , not so easy process and updating it on different places , however this will change once the saving account portability comes .
Note that this can take some time because before the portability, all the account numbers will have to be recreated with same digits and same format.