Thanks everyone for your opinions/suggestions on the My Touch 3G and I-Phone. I just upgraded from a Samsung Behold to a My Touch 3G - I will receive the phone today actually.
My younger son just switched from T-Mobile to AT & T just for the I-Phone. His fiance switched, too. So far he is happy with it. He is a real stickler about his phones and has sent many back over his 8 years with T-Mobile, so it will be a wait and see with him. He tires of them easily.
My older son has been an AT & T customer since they merged with Cingular. After playing with his brother's I-Phone, he got the itch for something new. He had a Blackberry (don't know the model), and actually considered switching to Version so he could get the Blackberry Storm. I suggested he should just go for the I-Phone rather than switch his service, so he did. So far he loves it, but mostly for the apps. He gets the music from his PC rather than pay for the I-Tumes.
With all these I-Phones in the house, my Behold is looking like a not so smart smart phone, so I am anxiously awaiting my My Touch today. My Behold, which is really a nice phone - very nicely constructed and a great camera - is very limited. No apps, no updates. I did have one app, Telenav, which was a free one year subscription from T-Mobile, but the subscription ran out over the weekend and I am not interested in paying $9.99 a month to renew the subscription. I have GPS in the car, so it's not that important, but after losing it, my Behold just seems like a regular phone... hence the upgrade! I can't wait!!
Again, thanks for all the posts. It really helps to hear from those who actually have these products.