The Department of Telecom, DoT has come out with new guidelines on SIM upgradation from 2G to 3G or 4G. It can be done only with a clear go-ahead from mobile users and on their request. The new guidelines have already come into effect. To upgrade the SIM card, the subscriber will have to generate a request through customer care or online or point of sale of the company. Once the request is received, the operator will issue a new SIM card to the subscriber. The new norms will put an end to automatic upgradation of SIM to allow high-value service by some operators.On receiving affirmative confirmation from the subscriber, the operator may initiate the process of deactivation of the old SIM card and activation of the new one.