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August 19, 2013

What is a Cell Phone Network Intercom?

A cell phone network intercom is an outdoor intercom that communicates wirelessly over the cell phone network with any landline or mobile phone anywhere in the world. They are also sometimes called GSM intercoms since the technology is based on the Global System for Mobile Communications standard. This standard is currently used worldwide, however, in the United States, only AT&T and T-Mobile and a few other service providers use GSM. Sprint and Verizon use CDMA (Code Division Multiple Access) technology so they are not compatible.

A cell phone intercom has a module in it that is essentially the hardware of a handheld cell phone that has been redesigned for the needs of a callbox intercom. The main difference is that the hardware is mounted inside a weather and vandal resistant stainless steel box and the speaker and microphone of the hardware are attached to the box. A Subscriber Identity Module (SIM) card is in inserted into the cell module and it identifies the subscriber to the...

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