Even as giddy consumers await delivery of their new iPhone 5s, a less happy side of mobile life is emerging. Think of it as iStrain, or wireless-induced financial anxiety. Once discretionary, cellphones have become a fact of life for most Americans. Nearly half of them pay $100 or more per month, and more than 1 in 10 consumers spend at least $200 a month, according to a September survey. That’s a major cost for families struggling to make ends meet.
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