Please check these topics first.
10 Taka Damer 1 Ta Card Recharge Koren Tahole Jante Parben.
there is no way withou calling oter person number to check or know ur own citycell number.But you can know othe operator number just see below
*511# to know banglalink number
*121*6*3# to know airtel number
*140*2*4# to know robi number
*111*8*2 or *2# to know grameen number
go to msg option and write whoami and send it to 321 number to know teletalk number and package
NB: all are free. no charge applicable to know ur number