When I was younger I had just gotten my first cell phone, one of those small candy bar style Nokia’s.
I used to hold it between my legs while I was studying.

One day I got really horny and played with the vibration setting.
I had a cheap, blue, landline phone in my room next to my bed. One night I placed my cell phone in a ziplock Baggie, inserted it as far as I could into my pussy, then dialled my cell from my home phone a few times.

Pretty sweet DIY Vibrator at the time.
Now I work in IT and I can say that my interest for technology comes from Nokia’s.

I still have that phone, I didn’t have the heart to throw it away after all the orgasms it gave to me.