Does not accept incoming calls Samsung. Why can't get through to me, although the phone is turned on

The attacker can implement an attack on the output of the phone from the working state, and the phone user will not even guess. Wherein mobile device will be included. Mobile device will not be able to make incoming calls and SMS messages. On the phone phone, the communication power indicator will show maximum value. To implement such an attack, the attackers do not turn to the cellular operator. The attacker can realize such an attack while spending not much effort. The only thing that gives the attack is a quick discharge of the phone battery. The phone will quickly discharge. Some phone models when exposed to attack include the backlight of the phone, and it does not turn off while the attack goes.

With such attacks, threats are created, in which possible breakdowns of important negotiations or critical situations when you need a working phone. Sometimes such attacks are only part of large Plan Regarding the user.

How do attackers implement such attacks?

The article on SMS spam describes the principle of operation of SMS services. But few knows that such services can be implemented by undocumented possibilities. There is a special form of SMS messages - invisible SMS. Such SMS are not displayed on the phone screen and are not notified by the phone about its receipt. Such SMS are commonly used by operators, to verify the existence of a mobile phone, but whatever the user would have learned about the request. The attackers can use this to implement DOS attack on a mobile phone.

The implementation of the DOS attack through the invisible SMS is implemented because the SMS messages implement the signal level in the GSM network. Such messages are clogged by the news channel. You can create generators send invisible messages using HTTP or SMPP protocols. The basis of invisible-SMS enters simple scheme. Table 1 shows the format sMS messages. Using these parts, an SMS is formed and the SMS center is sent.

Table 1.

Field	Size in octets.	A type	Description
command_Length.	4	integer	Length of the entire message
command_ID	4	integer	The identifier of the entire message
command_status.	4	integer	Status
command_Number	4	integer	Unique serial number
service_Type.	4	string	Service type or NULL
source_addr_ton.	max 6.	integer	Type of sender number
source_addr_NPI	1	integer	Sender indicator
source_addr.	1	string	Address of the sender
dest_ADDR_TON.	max 21.	integer	Recipient number type
dest_addr_npi	1	integer	Indenticator sender
dest_addr.	1	string	Address of the recipient
eSM_CLASS.	max 21.	integer	Message type
protocol_id	1	integer	Protocol identifier
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