The first model, I had to change, firstly because the battery is not long held and the phone on the other hand always hung. The key lock did not work so. Furthermore, the phone frequently on the button on the back that triggered the emergency call ... but the exchange went smoothly. The second phone was then the crowning glory! It took about 4 weeks, until the color of the buttons broke! Although the battery lasted, but the key lock was again useless. An exchange on Amazon no longer went, the contact on the manufacturer Swisstone is cumbersome, so I threw the phone in the trash. Never again will I buy such a cheap phone for my father !! Sometimes it is true: who buys cheap, buys twice ...