Who says wireless carriers can't be friends -- or, at the very least, can't exchange a bit of spectrum here and there? T-Mobile this morning let it be known that it has entered into a deal involving the "purchase and exchange" of spectrum licenses in 218 markets in the US. The magenta-tinged carrier says the deal will help improve its position in 15 of the US's top 25 markets and should help with next year's LTE rollout. All of this is pending regulatory approval, of course, some of which hinges upon Verizon's own license purchasing from the likes of SpectrumCo, Cox and Le
