AT&T will begin selling 4G wireless service and packages to prepaid GoPhone subscribers on Friday, the carrier announced. Pricing for the four plans runs from $25 a month -- for 250 minutes of voice, unlimited texts and an option for 50 megabytes of data -- to $60 a month for unlimited calling and texts, plus 2 gigabytes of data. AT&T also said it will update its iPhone 4S and iPhone 5 models to add support for the year-old national Wireless Emergency Alert System.

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