I bought my first one in 1998 or 1999. It was a Nokia 5190, a venerable beast that lasted me years and years. I'd probably still be using it today if I hadn't one day left it on the roof of my car, to fall in a ditch as I was accelerating onto the freeway. (In fact, it was found by a trucker, who tried to get it back to me, but we were never able to connect, so I just bought a new phone...)
So, 1999. I was in 3rd year of university, cell phones ("digital PCS phones", were what they were being sold as) were JUST starting to become popular, and I signed onto a pay-as-you-go plan. The whole thing cost me just over $100. Sadly, my first real use of the phone was a day or two after I bought it. My grandfather had just died, and my mother was in hysterics on the home phone with her sister. I used my cell phone to place a call to our pastor so he could come over and console the family.
Things took a more embarrassing turn a few days later. Since this was a brand new phone, and I hadn't yet given anyone the number, I didn't think to turn off the phone or the ringer when I brought it to class. I was thus mortified when, in the middle of the lecture, someone's phone started to ring. It took me a few seconds to clue in that it was MINE, and a few more seconds as I scrambled to dig it out of my jacket pocket to hastily reject the call. (Remember, this was just when cell phones were starting to really enter popular culture, so it was a BIG SPECTACLE. Everyone was staring at me.)
I thought it was finally over... until it happened again about 20 minutes later. And later again! (I finally wised up and turned the $#@$! off!) Turns out, the number I was assigned used to belong to another girl. And that day was her birthday... all her friends were calling!
That story got around among my friends and they continue to laugh about it, even today.