Intercom app for Android and iPhone, to speak aloud without phone and internet

Intercoms are voice communication devices that do not use the telephone line, a bit like walkie talkies are.
Then the opportunity to use the smartphone as an intercom or a walkie talkie becomes interesting, so you can communicate with someone without using the telephone line, at home, in an office, at school or while traveling by car or motorbike, even in the absence of internet connection.
This type of application can be useful as an intercom for those who make excursions, for those who travel a lot in the company of someone, each with their own motorbike or other vehicle, or even at home, as a baby monitor from a mobile phone or to communicate with someone who is on another floor or in another apartment.
In the past I had already dealt with the topic and found the best apps to transform the smartphone into Walkie Talkies such as Voxer and Zello which, basically, are based on voice messages and the "Push to Talk" sending mode, where we speak once for one.
In this case I wanted to go more on the intercom Apps, finding applications that can work to communicate in a limited environment (not therefore between people in different cities), that work to speak to each other without phone and independently from an internet connection, both on Android phones (Samsung, Huawei etc.) and iPhones .
One of the best applications to make the phone work as an intercom is definitely Walkie Tooth, which only works on Android and is much better than the more famous BTTalk.
Having two Android smartphones it is possible to call by voice immediately using bluetooth, or an active wifi network, or even with Wifi Direct, i.e. a direct Wifi connection between two devices.
The app also supports the creation of a network with Hotspot, so as to work without problems even if you are in an area without connections (even if the cell phones should not be too far away).
With this WalkieTooth it is also possible, in addition to speaking to each other, to send photos.
In the settings you can activate a voice filter and make the volume keys work as voice activators, a bit like you would with walkie talkies.
Looking for an application that really works to make an intercom with the mobile phone and that also works on the iPhone as well as on the Samsung, huawei and Android phones in general, we must install Intercom .
Intercom for Android is free while Intercom for iPhone costs 2 Euros.
This app also works without internet connection and works via Bluetooth or Wifi with Hotspot.
Group conversations can be made, in the sense of being able to put several telephones in communication together and can function as an intercom.
You can therefore place a smartphone in an environment, for example close to a baby in the cradle, so that you can continuously listen to the sounds as you would with a baby monitor.
In addition, thanks to the ability to communicate without the need to press buttons, it is also useful for those who go on motorbikes with friends.
Another application that makes the phone work like a walkie talkie is the simple Two Way, free for iPhone and Android.

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