Section 1: Baby Monitor (Baby Alarm/Radio Nanny) is a great tool for parents to help them relax and have some free time. It works without internet and can be used with a simple phone, not just a smartphone. It has features such as call me back, pause at start and after alarm/call, two-way talkback, turning on the speakerphone delay, microphone sensitivity adjustment, and auto silent mode.
Section 2: Before using the Baby Monitor, make sure the device has enough power and is within 2m of the child. Configure the app by selecting a phone number from the phone book or entering it with the keyboard. Adjust the noise level to the desired parameter and switch on the pause at startup. During an active call, the speakerphone can be turned on to listen to surrounding sounds and speak soothing words to the child.
Section 3: Mary Baby Monitor can call you with any SIM-card and is constantly adding support for new Dual SIM phones. It also has a call me back feature and can be set to auto silent mode. If you need help translating the app to your language, you can follow the link provided.