My request was to obtain a relatively "quiet" option, which is not practicable. So we were in different baby stores and have looked after children phones. The price margin of 5 up to 20 Euro offered throughout the same picture. Either the phone was 15 euros "expensive" as Disney or another brand it was (and extremely loud) or it was under 10 euros and even louder.
The Bieco however, met our needs. The volume can be compared to a conversation "quiet". While it is relatively large but by something more robust and also has correspondingly large buttons.
Overall, the phone has 6 buttons with the following functions
1) The numbers 1-4 (with different key tones, which make the 3 star people under the blue Teddy in the "Display" in a different order)
2) The handset key where different background music light up the 3 stars
3) says the teddy in the "Display" of the "Hello" or "How are you?
Conclusion
====
The only children's mobile phone that came to us because of the "volume" in question. Here one must not be afraid that the child gets a hearing impairment when it runs around the whole day. While not the smallest model, but with the characteristics which (when we have just under 3 years) should have for children. Robust and not too loud if you hold it to your ear