T-Mobile has been putting the heat on rivals, including prepaid carrier Leap WirelessAT&T is preparing to close its planned acquisition of Leap within a matter of weeks, even though it has been bleeding customers in part due to T-Mobile's aggression in prepaid markets. The deal comes at just the right time for Leap investors, and AT&T could actually make it work since it will enjoy key strategic gains in spectrum and prepaid branding. Ma Bell is able to address Cricket customers' biggest complaint.

In this week's Tech Teardown, host Erin Kennedy and Motley Fool tech and telecom bureau chief Evan Niu break down the biggest stories in tech for investors this week. They look at AT&T's upcoming acquisition of Leap Wireless, two stories facing Facebook this week, Twitter's trend of declining ad prices, BlackBerry's struggles to monetize its BBM messenger service, and Microsoft's new low-cost version of Windows.

So which smartphone giant wins the mobile war in the end?
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Erin Kennedy owns shares of LinkedIn. Evan Niu, CFA owns shares of LinkedIn. The Motley Fool recommends Facebook, Google, LinkedIn, and Twitter. The Motley Fool owns shares of Facebook, Google, LinkedIn, and Microsoft. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.