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I'm pretty sure AT&T could do some packet filtering and block those bad sms.

I'm sure AT&T would love that. Virus protection, now from AT&T, only $20 more per month to protect your iPhone.

I don't think I'd trust them to keep up with all the new threats.

AT&T isn't the only carrier with iPhones, though. I can't imagine Telcel bothering, for example.