Deutsche Telekom AG

Call All

CallAll is the easiest way to talk to many friends on the phone at the same time. Simply download the app, select up to five contacts from the address book and start a telephone conference. You do not have to register for CallAll, and there are no monthly charges. Due to its clear and concise design the app makes it very easy to reach friends spontaneously. You can also save individual groups with names and pictures and quickly get them all on the phone again for the next call.

Usability

CallAll is a prime example of simple design because the core of the app consists of exactly one single screen. The interactions required for operation very closely resemble those of the operating system so that the customer does not have to learn any new interactions.