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BSNL is, however, not done with its announcements for now. The company has begun pilot testing the 4G network in few circles such as Kerala and Gujarat. Therefore, BSNL 4G subscribers will be able to enjoy 4G VoLTE calls in these circles for now. To promote its 4G VoLTE network, BSNL is also offering free data to those subscribers who are upgrading to the 4G SIM card. So far, it's been reported that BSNL is giving up to 2GB of free data if some upgrades to the 4G SIM card. The offer is only accessible in those circles where the 4G network is deployed.