Many konftel models perform beautifully in multiple situations and offer solutions that integrate with your existing equipment the optional dect or cell phone cable connects easily to your phone and give more powerful audio quality switch and combine connections in the 300 series using the line mode selector compatibility apple iphone 4 apple iphone 3gs apple iphone 4s apple iphone 5 apple iphone 5s apple iphone 5c blackberry 8900 blackberry 9530