How to get my iPhone working?

A friend gave me their old iPhone 4, but I'm not sure how to get it working.

I have the sim in, it's on and fully charged but I can't seem to get any further than an option to make an emergency call (see picture)

Please help?
How to get my iPhone working

At 90 kg you are probably about 30 kg overweight.

Download itunes on your computer and have it sync to your itunes. After that it'll walk you through what you have to do and you can use it.

1.Turn off your device. If you can't turn it off, press and hold the Sleep/Wake and Home buttons at the same time and wait a few seconds for it to turn off
2.Plug the device's USB cable into your computer only.
3.Hold down the device's Home button as you connect the USB cable to it.
4When you see the Connect to iTunes screen, release the Home button. If you don't see this screen, try steps 1 through 3 one more time.
After all of that restore it from itunes.