This duo of phones is very easy to use. The devices are lightweight and have a very friendly interface. Therefore the use is very intuitive. I particularly appreciate the possibility to talk to 3. The directory tranfer from one phone to another is done quickly and easily. After a year of use I bring a damper on these phones, they do not take all the load. A rather long conversation, forgetting the phone outside in the cradle and you can not use it. They recharge quickly but it's still a disadvantage. This is the first time I am disappointed by Siemens. I use them for years