Adding more features to a landline phone will help protract its existence. One such feature to a landline is a motion-detecting system. Over at Hammacher, theyâve come out with a phone that will secure your house when youâre not there. The motion-detecting telephone dials a pre-set number when it detects movement. If the trespasser sounds unfamiliar, you can call the police. It is available for just under $60 and it also functions as a normal phone.