I bought the Simvalley Mobile comfort cellphone XL-901 with Garantruf for my father. He wanted an emergency phone! So when an emergency occurs, he gets help. But he can not make it off the phone, since the slider on the side is much too small and too heavy going. Thus, we have started it. In your pocket, it sparked an emergency after another. Unfortunately, you can not turn up the volume. Even as a healthy person has to understand problems his interlocutor. Not for the elderly.