I used Skype on the weekend to call my brother on his home phone, the volume on 100% was adequate but no more. I hung up and used my Lumia 1520 on Skype instead using the speaker phone and that was better. I compared the test volumes at 50% and 100% against an SP3 in the shop and they were the same. Overall, not a positive experience. I did some comparisons using the Skype test call service on a MacBook and another Asus W8.1 laptop I had and both were fine.