In its latest round of cost cuts, J.P. Morgan Chase & Co. is picking BlackBerrys. The nation’s largest bank by assets is hoping to save tens of millions of dollars by eliminating support for the BlackBerry wireless devices next year and mandating that some employees pay for their own devices, BlackBerry or otherwise, according to people close to the bank. J.P. Morgan, led by Chairman and Chief Executive James Dimon, will shed new light on its expenses Tuesday afternoon, when it is set to disclose its third-quarter results.

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