After 5 seconds when the phone has been turned on, it freezes for around 15 seconds. This is annoying because if you need to make a call quickly, you have to wait until it unfreezes.
Really easy to use and very attractive.
You're quite right. The best solution is to keep the mobile turned on. If you don't want to be disturbed, just press down the "C" key, and the sound is turned off. The battery capacity is enough to have it turned on for days.