Finding own mobile number for Idea SIM card is easy and free of cost, works even if there is no talk time balance in your mobile number The easiest and best method is to use USSD code USSD is nothing but U nstructured S upplementary S ervice D ata You have to type the USSD code in your home screen . It is similar to dialing a phone number. To find own mobile number in Idea From your mobile phone with Idea SIM card, dial the ussd code *789# Press call Button Now your mobile number for Idea SIM card will be displayed in your mobile screen. Note it down and save it in contacts for future references This method is free of cost and works even if there is no balance in your main account If the above number is not working for your region, you can also dial one of the following USSD codes to know your own mobile number in Idea SIM. *147*8*2# for UP west, North east, Orissa, Maharastra and other northern states *147# works for Assam *147*2*4# works...