I have released a first version of the field test / network monitoring application for Android 7 (Nougat) devices. With this app, you will be able to collect xARFCN data from the network and know which frequency band your smartphone is using.
I started to develop a FieldTest application for Android that I will publish on Google Play for everyone to use. I wanted to do this because of the frustration of not being able to find an app that is both eye-candy and reports useful information from my network.
Recently I discovered that Android N (7.0) provides a new method getArfcn() to get the Absolute Radio Frequency Channel Number, which gives you the exact frequency identifier that is used by the mobile phone on 2G (ARFCN), 3G (UARFCN) or 4G (EARFCN).
More and more operators are announcing the shutdown of their 2G network, in a move to reallocate the spectrum for data services on 4G and better utilize the resource to deliver content to their subscribers. Telstra in Australia will be the next in line in December 2016, and many other operators are scheduled for 2017.
You probably heard this strange robotic noise from your speakers when a cellphone was nearby and about to receive a call or an SMS. But do you know why this audible noise interference happens and why the sequences of buzz is always exactly the same?