My iphone keeps shocking me?

I have a iphone 4, and everytime i plug it up, and i press the lock button i feel like a shock in my finger, then it spreads to my full hand. I have asked my mom for a iphone 5c for my birthday, since i'm pretty sure mine is dangerous, lol. When it shocks me, it kinda makes my hand go numb for a second or two. Its really freaking me out, what is this?

It's Winter, touch some metal before your phone, to release the static electricity

Reboot the iphone. Leave it off for a while. Then turn it back on.

the iphone is nor perfect and at times the electricity doesn't flow into the right places, causing a fire and stuff like that.

… It won't work properly in freezing weather. If you live in the eastern US Or Canada.

well my thumb went numb and i couldn't really touch anything could i?

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