I had a Nextel i500 through work. And the phone was a brick, the case it came with had a belt loop and not a clip and since it was set up for work and we used PTT all the time we couldn't just call a co-workers phone because it didn't have a phone book that could handle both PTT and cell numbers.
Complete waste of time.
A close second worst phone for me was my old Motorola V60. The antenna would always break. I had that thing replaced like 5 times. The manufacturer wouldn't cover the replacement since it came with a holster and if you didn't use it you voided the warranty.
For me that would undoubtedly be the Nokia E62.
The phone did a lot and did it all poorly. Gave up on it after two days. Got a Pearl and have been smiling ever since
The Sidekick II. Mainly because it managed to annoy me, and because the battery gave me issues on two different devices. After a few months it'd totally stop charging. And to make up for it, T-Mobile gave me a ridiculous little motorola phone to make up for all the info I lost over the 4 days I waited for a new device.
My worst phone ever was my very first phone from AT&T...an itty bitty Panasonic. After a year, it completely stopped charging on me and if I would talk on it for more than five minutes, the battery was half way drained.
Well, I've had 2 BBs, 9 Nokias, and 2 Sony-Ericsson T62s in my family, . The T62s weren't bad, but weren't as good as the Nokias, and I had to have mine replaced because the headset jack came loose and got all staticky, so the T62 loses.
My mother-in-law's Moto V60 was an unmitigated POS.
I wanted the Pink Razr soo bad when it came it, got it and i hated it with a passion for the whole year i had it, such a garbage phone!! Actually i wasn't to impressed with any Motorola phone I owned. Then came along my White pearl
I guess I've been fairly lucky because I've never had a phone that was truly awful. My first cell I had was a HUGE Motoroloa flip phone. The battery life was pretty pitiful and it was so big and bulky. I seem to recall that it only cost $7.99/month, but I don't remember how many minutes that included. Gee, guess I've just dated myself a bit.