Here is a list of almost all BSNL prepaid balance enquiry viaUSSD(Unstructured Supplementary Services Data) Prepaid Enquiry ServicesDial *102# —>To know Last Call/SMS/GPRS DetailsDial *123# —>To know Your Mobile Number,Plan,Main Account Balance.Expiry Date etcDial *124# —>To know your Friends & Family NumbersDial *124*1# —>To know Limited & Unlimited Voice(STV401/STV501) detailsDial *124*2#—>To know Unlimited Local STV300 expiry dateDial *124*3# —>To know SMS STV’s balanceDial *124*4#—>To know GPRS STVs balanceDial *124*6#—> ISD STVs balance BSNL Data Balance Enq 2G Customers : Send SMS DATA2G to 53733 3G Customers : Send SMS DATA3G to 53733IPAD/Data Customer 2G : Send SMS DATA2G< Mobile Number