Hello maquemali!
Thank you for your response. Concerning this mobile app thing, I think I don´t need it. I bought my mobile 12 years ago in a second hand shop. It was already a couple of years old then. It´s great: you can use it for making telephone calls and sending and receiving SMS. And I use it even as an alarm clock. That´s all I want a phone to do. I bought 3 of them in this shop. I´ve been using no. 2 for the last 6 years and it seems it is quality built. Imagining it to work properly 6 more years and taking in the fact, that there is still no. 3 lying in my drawer I think it may be around the year 2031, when I will have to waste time and money by looking for another mobile.
I don´t know, whether your link will be still working then. :-)
Enjoy your day!
Rolf