Earlier this year, T-Mobile spent superyacht money on new spectrum licenses. For a cool $8 billion, T-Mobile got the right to use 600MHz spectrum all across the country, which should do wonders for making T-Mobile's network broader and more reliable (although potentially not much faster).
But one problem with rolling out new wireless spectrum is compatibility. Old devices won't be able to use new spectrum, and even brand-new devices will have to be made with T-Mobile's new network in mind.
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