With good wireless access at work and home, I can use Starbucks wifi if I really need to check email on my iPhone while on the go. There seems to be Starbucks shops at every street corner these days!
It now makes me wonder how much I really need the 3G network for data access. I've heard rumors that AT&T will no longer be allowing unlimited data plan usage in the near future. They'll be charging money based on your pre-selected data plan.
Given more wifi accessibility now, it may be more cost-effective for me to purchase a simple cell phone and deactivate my iPhone so that it essentially becomes an wifi-capable iTouch with a camera. Hmm...
Happy surfing.