UP MGA Master na SOLVED din yung problema ko by AT COMMANDS.
eto po yung Command para e delete yung all msg sa inbox read/unread lahat mismo e de delete nya.
AT+CMGD=,4
Meron pa yang mga Madaming Commands like yung na Read lang e Delete mo. pero di ko na need yun kasi all msg gusto ko e delete. Salamat AT commands at Zerotier dahil kahit nasa malayo ako na a access ko parin yung OTP ng Main Simcard ko basta may Internet lang na aaccess ko parin Dashboard yahooooo.
//Delete SMS message at index 1
AT+cmgd=1
//Delete SMS message at index 2
AT+cmgd=2
//Delete SMS message at index 3
AT+cmgd=3
//Delete all read messages SMS messages, leave unread
//messages and stored MO messages untouched
AT+cmgd=,1
//Delete all read messages SMS messages and sent Mobile
//originated messages, leave unread messages and unsent MO
//messages untouched
AT+cmgd=,2
//Delete all read messages SMS messages. sent and unsent
//Mobile originated messages, leave unread messages untouched
AT+cmgd=,3
//Delete all messages including unread messages
AT+cmgd=,4