I used to have a data only device via att. I got corporate discounts via my work, and by having two separate lines i was able to double the discount and pay a $25 unlimited data monthly fee. I wanted an ipod touch, and figured why not get an iphone to use on my data only line. The problem was, Apple & att wouldnt activate a data only iphone. The loophole was that if you are hearing impaired then apple would activate the device as data only. My dad is hard of hearing from working in construction industry, and I thought that may be an vessel towards my data only iphone. In the end, I just bought an ipod touch, ended my data only device and added data to my other line since I switched to sprint which included data for the same price att was charging me for just talk & text.
Looking back at my $25 a month unlimited data plan, I regret not pushing for the data only iphone. I could have ported my actual cell number to google voice and paid $25 a month (total bill after taxes) for unlimited everything.