Iphone 6s freezing

Basics from the user guide have always been, and continue to be: restart, reset, restore from backup, restore as new.

I’m also having severe problems with this iPhone 6S, 64Gb. When I start the phone from it takes ages to move screens and launch apps. It’s frozen for up to a minute or longer. It’s constantly switching between wifi and 3G. It’s basically making it unusable. When I unlock it from the screen, it takes ages for the screens and apps to become usable. Apps need to be touched 3-4 times to launch them. It can take up to 5 minutes for the phone to become usable. The home button needs to pressed 3-4 times for it to work. Yet when I place it in Airplane mode (i.e. no connection) everything works perfectly. So, something’s wrong with the phone. I’m going to try it for another day and if this continues, would like a replacement. Thankfully, this is a work iPhone, so I'm not going to put up with this kind of crappy hardware.

Oh, and another thing. When it's charging from the mains, there's a slight hum/vibration. Very odd.

HHello, I too have had exactly the issues since xgetting my iPhone 6s on Tuesday, bizarrely though since I've taken the glass screen protector off its working fine!

Contact Apple but in the mean time try turning off wifi assist, that may stop it roaming from your wifi to 3G. Have you updated to iOS 9.1 and have you tried a hard reset? (hole power button and home button and the same time. I found mine took about 24 hours after 9.1 and now the lag is pretty much gone and I can open apps instantly I wake the phone. If you have no luck try restoring as new, if that does not work contact Apple, they can do a remote diagnostic to heck the phone out.