Here's how it breaks down so far....


If you’re buying an iPhone 4S, which network should you pick? That really depends on your priorities:

If you care about speed the most, AT&T is your best choice.
If you care about simultaneous talking and web surfing, AT&T is your best choice as well
If you’re very price-conscious, Sprint is the way to go.
If you care about unlimited data, Sprint is the only one that offers a new plan.
If your concern is network reliability, you need to test the different networks in the areas you visit most.
If you travel a lot and want constant 3G access, Verizon is your best bet.
In a few years, we’ll have to revisit this issue as 4G networks become more mainstream. But for right now, iPhone users have more choices than ever.

Edit: More news regarding the Micro Sim for Verizion and sprint.

a new wrinkle that potentially makes the international-roaming experience better on Sprint and Verizon iPhones than it is on AT&T. Sprint plans to sell the iPhone 4S with its micro-SIM slot unlocked; Verizon’s will be initially locked, but if you’ve been a customer in good standing for 60 days, you can call Verizon and ask for an “international unlock.” (A Verizon spokesperson told me that this is Verizon’s standard policy for all world phones—it’s just the first time it’s manifested itself on an iPhone.)

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