Below is a video describing a wireless gsm intercom available from IntercomsOnline.com. This Cell Phone intercom uses GSM cell phone technology to make calls to any landline or cell phone. You can place the intercom anywhere you can get cell phone service from AT&T or T-Mobile in the U.S., or Rogers in Canada. Other carriers like Sprint and Verizon use CDMA technology so the unit will not work on those.
With this intercom you don’t have to worry about range limitations of normal systems. As long as you have good service where you want to put it, range is unlimited.
This unit works well for driveway gate communication. When people drive up to the the gate and press the button, it will call pre-programmed telephone numbers so you can be anywhere in the world and still talk to visitors. You can press a key on your telephone’s keypad to activate an electric gate opener.
A keypad version allows people to enter codes to enter without having to press the call button. You can also program people’s cell phone numbers in the system so when they drive up to the gate, they can call the gate intercom and the gate will open based on their calling line ID info.
Programming the unit is done via text messaging so it can be done from anywhere.
An app is available that enables you to open the gate from the app.
To use it, you will need a cell phone plan from one of the wireless carriers mentioned.