Open the dialer menu and dial *102# then press Call or Send button of your phone. (Free)
Open the dialer menu and dial *143# the press Call or Send button. Just select the promo category you currently subscribe then inquire its status by keying the number option. You can also inquire your friend or other numbers balance by selecting that option on *143# menu.
Open the dialer menu and call 802. This option will charge you P1 per balance inquiry process made. You can hear the remaining amount of your account through voice message.