transfer prepaid mobile balance

[uumeshh]

i have moved from kerala to maharashtra and taken a new BSNL sim card. But i have a lot of balance left in the old BSNL sim. Is it possible to transfer the balance from the old sim to the new one?? i asked the CC and they said no, but i see some tricks on the internet, none of which have worked for me. Has anybody tried this. Pls lemme know if it works.