War dialing, also called scanning, is dialing a large number of telephone numbers in the hope of finding anything interesting. Interesting items often include test tones, computers, Voice Mail Boxes (VMB's), Private Branch Exchanges (PBX's), and government offices. A common technique is to find one telephone number owned by a target and then to war …
Cell phone cloning refers to the act of copying the identity of one mobile telephone to another. This is usually done to make fraudulent telephone calls. The bill for the calls go to the legitimate subscriber. This made cloning very popular in areas with large immigrant populations, where the cost to “call home” was very …
As many people are fed up with their cell phone providers, a new trend has opened up for tracphones. A tracphone, or TracFone, is a prepaid phone that gives you the accessibility of a contract plan without the commitment. Tracphones have become much more popular in the past few months as more people are finally …
Tumbling exploits a weakness in the AMPS/NAMPS roaming system. In tumbling, you first configure the SIDH in your mobile telephone to pretend to be from another cellular carrier. If you are in Colorado, for example, you would configure your mobile telephone as if it were subscribed to a cellular carrier in Texas. Next, you modify …
Cell phone frequencies are the frequency ranges within the Ultra High Frequency (UHF) band that are designated for cell phone use. Bluetooth devices, wireless networks, and television signals also use this frequency band. Although cellular phone systems divide cities and geographic areas into smaller cells of coverage, it allows for a fair amount of frequency …
Each GSM and UMTS mobile phone has a unique IMEI (International Mobile Equipment Identity) number. An IMEI number facilitates an important function – it easily identifies a mobile phone being used on a GSM (Global System for Mobile Communications) network. The IMEI is a useful tool to stop a stolen phone from accessing a network …
Since the number of cell phone users has continued to increase to more than six billion subscriptions at the turn of the decade, a common question that continues to get asked is how dangerous are mobile phones to one’s health? This question has continued to be asked over the past several decades since mobile phones …
Loop start is a a signaling technique in which a party gets a dial tone by closing (shorting) a DC current loop. In a loop start signaling system, the electrical loop between your telephone and your central office (CO) is normally open. When you pick up the telephone handset, it causes a circuit to be …
A 66 block is a punch-down block used to connect wiring for telephone systems and other low-speed low-voltage wiring applications. A punch-down tool is used to force solid wire into metal slots on the 66 block. The 25-pair standard non-split 66 Block encloses 50 rows; each row has four columns of clips that are electrically …
With the expansion of Voice over IP and cellular phone technologies over the past decade, it has never been more cheaper to call international phone numbers. A common barrier for consumers trying to call friends, family, or business contacts that live abroad is determining how to dial international phone numbers from your country. International Dialing …