For such an expensive phone the quality is poor. I took my phone to the Apple store on Saturday because when i was making calls the person on the other end would not be able to hear me at certain times. I think the phone was confused on whether I had a headset in or not. The woman at The Apple Store made me feel a bit awkward like there wasn't a problem but hey she swapped my phone for a new one. When I got it home I discovered when it vibrated it made a horrible noise as if it was rattling all the components and when I use Siri the speaker distorts. So I am taking this one back tomorrow. I feel like an idiot for taking it back but it is sub standard not only that but I bought a £12 screen guard at the store on Saturday and now its on the phone I am taking back so I have lost out there. I am really dissapointed in the quality.