Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Siemens 4210 call waiting switch problem

I have exchanged the phone four times. And I still can not switch to another line using call waiting switch.Customer support could not resolve the problem and recommended to return the phone to the store. Compared to my Panasonic 1000 this phone has very short operational distance. Walls are the killer of the reception (with Panasonic it is working just fine). The only positive experience I have with the phone is the sound quality. It is much better than Panasonic. I am very sorry about Siemens quality.