OK...back to war! ...check it out...1st...on big security systems...the "system" uses both fix phone lines as GSM networks...if the phone is off the hook, the alarm bypass for the GSM modem...that has a PIN card...if its an inside job (still on insiders...) than you leave the building, changing the PIN code, since you have the valid one. NOW...what's the good news? This PIN card is used by mobile phone...meaning 1st stealing the security mobile phone of the facility, with or without internal help. 2nd have just the mobile number, and hack the SIM card.
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