In the USA, the cellphone blacklist is operated by the CTIA, which works with leading cellphone providers including AT&T, Cellcom, Nex-Tech Wireless, Sprint, T-Mobile USA, and Verizon Wireless to provide a vast database of blacklisted phones. Even when you jailbreak a phone, your IMEI will still give your chosen service provider the information they need to know.Įach time you switch your phone on or attempt to make a call, the network systems check the IMEI number of the handset you are using as soon as you insert a SIM card.
Even if you switch to a different type of phone, a BlackBerry or an Android, your service provider will know which phone you are using. So for example, it’s the IMEI, and not your customer profile that lets a large carrier such as AT&T know that you are using an iPhone. If the phone is locked to another carrier or if it’s lost or stolen your service provider can use the IMEI to “blacklist” a device which means you won’t be able to make calls. The IMEI or ESN identifies the phone to your carrier and it checks that the handset is valid to use.
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Like IMEI, Code Division Multiple Access (CDMA) devices also use something similar called an Electronic Serial number, or ESN. Before that can happen, however, the network will check your phone’s IMEI, which is a number that is unique to every GSM handset. If your account is in order, then you can make the call and use the services of your service provider. Global mobile connections now exceed some 10 billion connections, and as of 2015, exceeds the total population of the globe.Īs a means of controlling this vast number of global connections, which is increasingly important in an age of international organized crime and terrorism, blacklisted IMEIs are provided to the GSMA central IMEI Database which allows operators to exchange data and to block devices on multiple networks both nationally and internationally.Įach time you make a call your SIM card immediately identifies you as a subscriber to that particular carrier. Groupe Speciale Mobile (GSM), established in 1982, defines the GSM standard as the internationally accepted digital cellular telephony standard. Participating operators have an up to date Device Check database which contains the IMEI for devices reported as stolen or lost, as well as the device model and capabilities.
The operator can block the phone from their mobile network, which is called IMEI blacklisting. In a growing number of countries, operators enable consumers to report a mobile phone or device as lost or stolen using the device’s unique identity number, the IMEI.
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It means millions of cellphones are out there being advertised daily on online auction sites and listing sites around the world that could well be stolen, and you won’t know anything about it until you arm yourself with what to look for and what questions to ask.Įvery mobile device in the world, whether it’s a cell phone or a tablet, has a unique serial number known as the IMEI (International Mobile Equipment Identifier). Think it can’t happen to you? In 2013 over 3.2 million cellphones were stolen in the United States alone, double the amount stolen in the previous year, so this is a fast growing problem. It sounds ideal, but unfortunately, buying a cellphone that is blacklisted can mean not only is your phone completely useless to you, you could potentially end up with a knock at the door from the police asking some difficult questions. A complete guide to blacklisted cell phones Blacklisted, Tips, UnlockBaseīuying a used cellphone can be a great idea: you can save money, obtain an already unlocked phone, or buy a brand or a particular model you couldn’t otherwise afford.
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