Yahoo Mobile Phone Advertising

I am not allowed to add my iPhone for mobile alerts, because AT & T is not a carrier offered or the iPhone.
AT & T is now my new carrier. I have an iPhone and can not register for mobile alerts. IPhone is not listed as one of the phones yet to announce that we can use Yahoo with the iPhone. What should I do to add my new phone?
1. Have the mobile alert sent the e-mail alert for you. Your iPhone will buzz when it receives a new e-mail 2. Enter your phone number and the use of services not included, the device is not luck.
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