iphone 6s plus wont charge/turn on

If iTunes recognized your device it means your iPhone is on and charging. If you’re experiencing software related issues you will have to replace your display assembly or home button in order to restore device.

Is your display black when you connect to iTunes?

I'm on the phone waiting for support to help me with the same issue. I find it hard to believe I can go from 49% battery to 0% to shutting down, the phone has been glitching the last few days and it is a replacement phone, which makes me more annoyed. I don't see why we have to pay to upgrade the battery, nor do I see why people are ok with just upgrading when they are perfectly happy with the phone they have.

If I get an answer, I will repost immediately. I've been on hold a few minutes.

I would like to ask you some questions in order to probe to find the best solution.

Have you attempt to charge device with different lighting cables, power adapter, and power source?

Does iTunes recognized your device but iPhone display present a blank-black display?

Switch from silent to ringer and if it vibrates it means your device iOS is on and running and you will need a display replacement.

Check the charging connector for pocket lint or damage on the charging pins.

If lint is found clean with nylon brush (dry tooth brush is fine) if damage on charging port is found then a whole unit replacement will be necessary.

Attempt to DFU device using iTunes

Contact Apple support in order to make appointment.

"My home button on my phone does not work"

You need to get the iPhone repaired > iPhone Repair - Official Apple Support